[Hibernate-JIRA] Created: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
12:23 p.m.
Using fetch="subselect" and second level cache causes NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate3
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
I've been tuning some of our mappings to use fetch="subselect" to reduce the
number of DB queries. However, I have run into two cases where I get the exception below.
In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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12:38 p.m.
New subject: [Hibernate-JIRA] Commented: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Adam Brod commented on HHH-3121:
--------------------------------
I am also getting this same exception when I map a one-to-many class as a set. When I
access the cuePoints property, I get the same NPE.
<set name="cuePoints" lazy="true"
table="video_cue_points" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="video_id"/>
<one-to-many class="VideoCuePoint" />
</set>
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate3
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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1:48 p.m.
New subject: [Hibernate-JIRA] Commented: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Adam Brod commented on HHH-3121:
--------------------------------
The only work around I have found is to remove fetch="subselect". Using
batch-size="xxx" helps to reduce the n+1 problem, but isn't as good as
subselect for my case.
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate3
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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11:57 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Gail Badner commented on HHH-3121:
----------------------------------
Please attach a runnable test case (Java + mapping) that reproduces this issue.
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate3
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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3:46 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Jeroen Resoort commented on HHH-3121:
-------------------------------------
I'm having the same issue at the moment. It started when i added setMaxResults to my
query.
I expect the following:
The original query returns a limited number of results. The subselect query returns the
sets for ALL results (including the results left out because of the maxResults).
The CollectionLoadContext class tries to access a collectionOwner that wasn't
returned
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion();
So another workaround besides removing subselect would be disabling maxResults.
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate3
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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4:15 p.m.
New subject: [Hibernate-JIRA] Commented: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Vesa Tuononen commented on HHH-3121:
------------------------------------
I was facing this issue in our project.
I try simplify to the main points...
High level pojo structure
Pojo1
@ManyToOne(EAGER)
@JoinColumn(name = "Pojo2_fk")
Pojo2
Pojo2
@OneToMany(EAGER, mappedBy="owner")
@Fetch(FetchMode.SUBSELECT)
Pojo3
Data in DB
Pojo1
fieldX Pojo2_fk
2 1
3 1
4 2
And HQL part
Query query = session.createQuery("select Pojo1 where fieldX>1 order by
fieldX");
query.setCacheable(true);
query.setFirstResult(0);
int fetchSize = 2;// If fetchSize 3 or more all works fine
query.setFetchSize(fetchSize);
query.setMaxResults(fetchSize);
List<Pojo1> l = (List<Pojo1>) query.list();
And working workaround was change the query handling to the following mode.
Query query = session.createQuery("select Pojo1 where fieldX>1 order by
fieldX");
query.setCacheable(true);
query.setFirstResult(0);
int fetchSize = 2;
query.setFetchSize(fetchSize);
//query.setMaxResults(fetchSize);
//List<Pojo1> l = (List<Pojo1>) query.list();
List<Pojo1> l = new ArrayList<Pojo1>(fetchSize);
Iterator<Pojo1> it = query.iterate();
for (int i = 0; i < fetchSize; i++) {
if (it.hasNext()) {
l.add(it.next());
} else {
break;
}
}
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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4:52 p.m.
New subject: [Hibernate-JIRA] Updated: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Samuel Mendenhall updated HHH-3121:
-----------------------------------
Attachment: CollectionIssue_TestProgram.zip
CollectionIssue_TestProgram.zip contains a testcase which will reproduce the
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
exception.
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Attachments: CollectionIssue_TestProgram.zip
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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12:36 a.m.
New subject: [Hibernate-JIRA] Assigned: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Strong Liu reassigned HHH-3121:
-------------------------------
Assignee: Strong Liu
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Assignee: Strong Liu
Attachments: CollectionIssue_TestProgram.zip
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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10:22 a.m.
New subject: [Hibernate-JIRA] Assigned: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Strong Liu reassigned HHH-3121:
-------------------------------
Assignee: (was: Strong Liu)
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Attachments: CollectionIssue_TestProgram.zip
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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10:28 a.m.
New subject: [Hibernate-JIRA] Updated: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Strong Liu updated HHH-3121:
----------------------------
Fix Version/s: 3.6.1
okay, i'm going to set the fix version to 3.6.1, it would be very helpful if we could
fix it in this release
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Fix For: 3.6.1
Attachments: CollectionIssue_TestProgram.zip
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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1:42 p.m.
New subject: [Hibernate-JIRA] Assigned: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Gail Badner reassigned HHH-3121:
--------------------------------
Assignee: Gail Badner
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Assignee: Gail Badner
Fix For: 3.6.1
Attachments: CollectionIssue_TestProgram.zip
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
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4:02 p.m.
New subject: [Hibernate-JIRA] Assigned: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Gail Badner reassigned HHH-3121:
--------------------------------
Assignee: Steve Ebersole (was: Gail Badner)
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Assignee: Steve Ebersole
Fix For: 3.6.1
Attachments: CollectionIssue_TestProgram.zip
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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9:35 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Steve Ebersole commented on HHH-3121:
-------------------------------------
I can reproduce the exception Samuel sees with his attached test case. The problem is
that his test case is very different from the situation described here. The only real
commonality is that they trigger an exception in the same piece of code.
However, I have tried now for about 2 hours and am not able to reproduce the actual
reported problem. So the description is missing something vital I need to reproduce
this.
At this point I am going to split Sammuel's test out into a separate issue with his
test case and work on that since I can at least reproduce it. I'll set this one back
to awaiting a test case to move forward.
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Assignee: Steve Ebersole
Fix For: 3.6.1
Attachments: CollectionIssue_TestProgram.zip
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
--
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10:58 a.m.
New subject: [Hibernate-JIRA] Updated: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Steve Ebersole updated HHH-3121:
--------------------------------
Attachment: (was: CollectionIssue_TestProgram.zip)
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Assignee: Steve Ebersole
Fix For: 3.6.1
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
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12:53 p.m.
New subject: [Hibernate-JIRA] Updated: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Gail Badner updated HHH-3121:
-----------------------------
Fix Version/s: (was: 3.6.1)
4.0.0.Alpha1
3.6.2
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Assignee: Steve Ebersole
Fix For: 3.6.2, 4.0.0.Alpha1
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
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8:01 p.m.
New subject: [Hibernate-JIRA] Reopened: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Steve Ebersole reopened HHH-3121:
---------------------------------
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Assignee: Steve Ebersole
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
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8:01 p.m.
New subject: [Hibernate-JIRA] Closed: (HHH-3121) Using fetch="subselect" and second level cache causes NullPointerException
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121?page=c...
]
Steve Ebersole closed HHH-3121.
-------------------------------
Resolution: Rejected
Fix Version/s: (was: 3.6.2)
(was: 4.0.0.Alpha1)
No test case
Using fetch="subselect" and second level cache causes
NullPointerException
--------------------------------------------------------------------------
Key: HHH-3121
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3121
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.6
Environment: Oracle 10g
Reporter: Adam Brod
Assignee: Steve Ebersole
I've been tuning some of our mappings to use fetch="subselect" to reduce
the number of DB queries. However, I have run into two cases where I get the exception
below. In both cases, I was loading a list of Videos, which are mapped to a list of other
objects. (In this example, Media is the superclass of Video.) I apologize that I
can't upload a full working example, but I will include the relevant mapping info.
<class name="Media" table="media" lazy="false"
discriminator-value="0">
<cache usage="nonstrict-read-write"/>
<id name="id" column="id" type="long">
<generator class="seqhilo"><param
name="sequence">hibernate_hi_sequence</param><param
name="max_lo">500</param></generator>
</id>
...
<list name="tags" lazy="true" table="media_tags"
cascade="save-update" fetch="subselect">
<cache usage="nonstrict-read-write"/>
<key column="media_id"/>
<list-index column="idx"/>
<many-to-many column="tag_id"
class="com.brightcove.catalog.Tag"/>
</list>
...
<subclass name="Video" lazy="false"
discriminator-value="1">
...
</subclass>
</class>
<class name="Tag" table="tag">
...
</class>
The HQL being executed is just a simple "from Video v where v.publisher_id =
:pubId".
The line of code where the exception is generated in Video.getDTO() is accessing the Tags
list:
for (Tag tag : getTags()) {
tags.add(tag.getDTO());
}
I've debugged into the Hibernate source to see where the NPE comes from
(CollectionLoadContext line 298).
if ( persister.isVersioned() ) {
versionComparator =
persister.getOwnerEntityPersister().getVersionType().getComparator();
final Object collectionOwner =
getLoadContext().getPersistenceContext().getCollectionOwner( lce.getKey(), persister );
version = getLoadContext().getPersistenceContext().getEntry( collectionOwner
).getVersion(); //NPE!
}
It seems that "collectionOwner" is null, so calling getEntry(collectionOwner)
returns null. Calling getVersion() on a null entry is what throws the NPE.
java.lang.NullPointerException
at
org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:298)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:256)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:222)
at
org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:195)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:877)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:865)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadCollectionSubselect(Loader.java:2066)
at
org.hibernate.loader.collection.SubselectCollectionLoader.initialize(SubselectCollectionLoader.java:58)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)
at
org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
at org.hibernate.collection.PersistentList.size(PersistentList.java:91)
at com.brightcove.catalog.EconomicEntity.populateDTO(EconomicEntity.java:460)
at com.brightcove.catalog.Media.populateDTO(Media.java:192)
at com.brightcove.catalog.Video.populateDTO(Video.java:854)
at com.brightcove.catalog.Video.getDTO(Video.java:783)
at com.brightcove.catalog.Video.getDTO(Video.java:756)
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6151
days old
hibernate-issues@lists.jboss.org
16 comments
7 participants
participants (7)
-
Adam Brod (JIRA) -
Gail Badner (JIRA)
-
Jeroen Resoort (JIRA)
-
Samuel Mendenhall (JIRA)
-
Steve Ebersole (JIRA)
-
Strong Liu (JIRA)
-
Vesa Tuononen (JIRA)