[Hibernate-JIRA] Created: (HHH-3487) DefaultLoadEventListener does not honor lazy load (LoadEventListener.LoadType.INTERNAL_LOAD_LAZY)
12:20 p.m.
DefaultLoadEventListener does not honor lazy load
(LoadEventListener.LoadType.INTERNAL_LOAD_LAZY)
-------------------------------------------------------------------------------------------------
Key: HHH-3487
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3487
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.3.1
Environment: N/A
Reporter: Will Hoover
Priority: Critical
DefaultLoadEventListener#doLoad(...) and DefaultLoadEventListener#loadFromDatasource(...)
does not honor LoadEventListener.LoadType.INTERNAL_LOAD_LAZY
USE CASE:
1) Create Actor table with self-referencing parent/child relationship with the following
mapping- results in SessionImpl#internalLoad(...) setting LoadEventListener.LoadType to
LoadEventListener.LoadType.INTERNAL_LOAD_LAZY:
<hibernate-mapping>
<class name="Actor" table="ACTOR">
<id name="id" type="java.lang.Long">
<column name="ID" precision="22" scale="0"
/>
<generator class="assigned" />
</id>
<many-to-one name="actor" class="Actor"
lazy="no-proxy">
<column name="PARENT_ID" precision="22"
scale="0" not-null="true" />
</many-to-one>
<set name="actors" inverse="true" >
<key>
<column name="PARENT_ID" precision="22"
scale="0" not-null="true" />
</key>
<one-to-many class="Actor" />
</set>
</class>
</hibernate-mapping>
2) Add a parent/child relationship entries in database: ID:1,PARENT_ID:1 and
ID:2,PARENT_ID:1
3) Issue "Actor actor = (Actor) session.get(Actor.class, 1L);"
Results: Hibernate.isPropertyInitialized(actor, "actor") == true
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12:22 p.m.
New subject: [Hibernate-JIRA] Commented: (HHH-3487) DefaultLoadEventListener does not honor lazy load (LoadEventListener.LoadType.INTERNAL_LOAD_LAZY)
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3487?page=c...
]
Will Hoover commented on HHH-3487:
----------------------------------
Correction: 3) should read:
Issue "Actor actor = (Actor) session.get(Actor.class, 2L);"
DefaultLoadEventListener does not honor lazy load
(LoadEventListener.LoadType.INTERNAL_LOAD_LAZY)
-------------------------------------------------------------------------------------------------
Key: HHH-3487
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3487
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.3.1
Environment: N/A
Reporter: Will Hoover
Priority: Critical
DefaultLoadEventListener#doLoad(...) and
DefaultLoadEventListener#loadFromDatasource(...) does not honor
LoadEventListener.LoadType.INTERNAL_LOAD_LAZY
USE CASE:
1) Create Actor table with self-referencing parent/child relationship with the following
mapping- results in SessionImpl#internalLoad(...) setting LoadEventListener.LoadType to
LoadEventListener.LoadType.INTERNAL_LOAD_LAZY:
<hibernate-mapping>
<class name="Actor" table="ACTOR">
<id name="id" type="java.lang.Long">
<column name="ID" precision="22" scale="0"
/>
<generator class="assigned" />
</id>
<many-to-one name="actor" class="Actor"
lazy="no-proxy">
<column name="PARENT_ID" precision="22"
scale="0" not-null="true" />
</many-to-one>
<set name="actors" inverse="true" >
<key>
<column name="PARENT_ID" precision="22"
scale="0" not-null="true" />
</key>
<one-to-many class="Actor" />
</set>
</class>
</hibernate-mapping>
2) Add a parent/child relationship entries in database: ID:1,PARENT_ID:1 and
ID:2,PARENT_ID:1
3) Issue "Actor actor = (Actor) session.get(Actor.class, 1L);"
Results: Hibernate.isPropertyInitialized(actor, "actor") == true
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12:35 p.m.
New subject: [Hibernate-JIRA] Commented: (HHH-3487) DefaultLoadEventListener does not honor lazy load (LoadEventListener.LoadType.INTERNAL_LOAD_LAZY)
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3487?page=c...
]
Will Hoover commented on HHH-3487:
----------------------------------
In the example the Actor class was final. according to
http://www.hibernate.org/hib_docs/reference/en/html/performance.html "you may not use
a CGLIB proxy for a final class or a class with any final methods". When final is
removed from the Actor class a proxy is used (as expected- see mapping example below).
<class name="Actor" table="ACTOR">
<id name="id" type="java.lang.Long">
<column name="ID" precision="22" scale="0"
/>
<generator class="assigned" />
</id>
<many-to-one name="actor" class="Actor">
<column name="PARENT_ID" precision="22"
scale="0" not-null="true" />
</many-to-one>
<set name="actors" inverse="true" >
<key>
<column name="PARENT_ID" precision="22"
scale="0" not-null="true" />
</key>
<one-to-many class="Actor" />
</set>
</class>
</hibernate-mapping>
Why would Hibernate query all of the single-ended relationships by default when a final
entity class is mapped? Seems odd that finalizing a mapped entity would cause such a
behavior. Wouldn't it be better to either throw an exception (or even log a message
stating that the relationship cannot be proxied) when this scenario occurs rather than
executing unnecessary queries?
DefaultLoadEventListener does not honor lazy load
(LoadEventListener.LoadType.INTERNAL_LOAD_LAZY)
-------------------------------------------------------------------------------------------------
Key: HHH-3487
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3487
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.3.1
Environment: N/A
Reporter: Will Hoover
Priority: Critical
DefaultLoadEventListener#doLoad(...) and
DefaultLoadEventListener#loadFromDatasource(...) does not honor
LoadEventListener.LoadType.INTERNAL_LOAD_LAZY
USE CASE:
1) Create Actor table with self-referencing parent/child relationship with the following
mapping- results in SessionImpl#internalLoad(...) setting LoadEventListener.LoadType to
LoadEventListener.LoadType.INTERNAL_LOAD_LAZY:
<hibernate-mapping>
<class name="Actor" table="ACTOR">
<id name="id" type="java.lang.Long">
<column name="ID" precision="22" scale="0"
/>
<generator class="assigned" />
</id>
<many-to-one name="actor" class="Actor"
lazy="no-proxy">
<column name="PARENT_ID" precision="22"
scale="0" not-null="true" />
</many-to-one>
<set name="actors" inverse="true" >
<key>
<column name="PARENT_ID" precision="22"
scale="0" not-null="true" />
</key>
<one-to-many class="Actor" />
</set>
</class>
</hibernate-mapping>
2) Add a parent/child relationship entries in database: ID:1,PARENT_ID:1 and
ID:2,PARENT_ID:1
3) Issue "Actor actor = (Actor) session.get(Actor.class, 1L);"
Results: Hibernate.isPropertyInitialized(actor, "actor") == true
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Will Hoover (JIRA)