[Hibernate-JIRA] Created: (HHH-2318) Sometimes wrong classloader used for proxy interfaces
by Jan Wiemer (JIRA)
Sometimes wrong classloader used for proxy interfaces
-----------------------------------------------------
Key: HHH-2318
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2318
Project: Hibernate3
Type: Bug
Components: core
Versions: 3.2.1
Reporter: Jan Wiemer
For some of our business classes we used a Mapping declaring the class to be lazy initialized and providing a proxy interface like e.g.:
<class name="TestClassImpl" proxy="TestClass" table="testTable" lazy="true"> ... </class>
Using classes mapped this way - e.g. as endpoint of a one to one relation - sporadically leads to exceptions like the following:
org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of test.AbstractTestClass2Impl.testField
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:104)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:337)
at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:200)
at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3514)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:129)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2211)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2095)
at org.hibernate.loader.Loader.list(Loader.java:2090)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:388)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:804)
Note that the application is residing in a different classloader than hibernate (and CGLIB...).
Examining the situation we see that the value passed to the setter was a CGLIB proxy. Internally the proxy stores an array of interfaces the proxy should implement. In our situation this interface contains the HibernateProxy interface and our business interface provided as proxy interface in the mapping. In this interface array we checked the classloader of the interfaces. As expected the HibernateProxy interface is loaded by the system classloader and our interface was loaded by our custom classloader. However examining the actual interfaces of the proxy (with proxy.getClass().getInterfaces()[i].getClassLoader() for all i) shows that all interfaces are loaded with the system classloader. This causes the exception above.
Doing some more experiments we experience that the problem does not occur all the time. Sometimes the actual proxy interfaces are as expected (the HibernateProxy interface is loaded by the system classloader and our interface was loaded by our custom classloader). We notice that each time the test failed the HibernateProxy was the first interface in the interface array stored in the proxy.
Some experiments with the CGLIB (the Enhancer class) shows us that (if there is no superclass given) they use the classloader of the first passed interface as default classloader (compare method net.sf.cglib.proxy.Enhancer.getDefaultClassLoader()).
Finally we find out that hibernate passes the proxy interfaces in an arbitrary order since they are using a HashSet for the proxy interfaces in the method org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PersistentClass persistentClass, Getter idGetter, Setter idSetter). This Hash set is passed to the method org.hibernate.proxy.pojo.cglib.CGLIB_ProxyFactory.postInstantiate(...). There it is simply converted to an Array (leading to a randomized order).
As a workaround it is possible to patch the class org.hibernate.proxy.pojo.cglib.CGLIB_ProxyFactory and add reorganize the array if the HibernateProxy interface is the first one:
this.interfaces = (Class[]) interfaces.toArray(NO_CLASSES);
//----->PATCH<--------
if(this.interfaces.length > 1) {
Class firstIfc = this.interfaces[0];
if(firstIfc.getName().startsWith("org.hibernate")) {
this.interfaces[0] = this.interfaces[1];
this.interfaces[1] = firstIfc;
System.err.println("Replace: " + firstIfc.getName() + " by " + this.interfaces[0].getName());
}
}
//--------------------
After applying this patch everything woks as expected.
Compare with the discussion in:
http://forum.hibernate.org/viewtopic.php?p=2334617#2334617
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11 years, 10 months
[Hibernate-JIRA] Created: (HHH-3603) Hibernate custome classloader
by Behrang Javaherian (JIRA)
Hibernate custome classloader
-----------------------------
Key: HHH-3603
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3603
Project: Hibernate Core
Issue Type: New Feature
Affects Versions: 3.3.0.GA
Reporter: Behrang Javaherian
We are trying to use hibernate in a OSGi like kind of environment. We have a code module that creates the session factory. We want to be able to add classes to session factory and recreated the session factory as needed. But hibernate is always using the current class loader which cause class cast exception if we try to add model classes from child bundles (which has their own class loader). To overcome this issue we had to patch the hibernate internal ReflectHelper and change the classForNameMethod to this:
return PlugableClassFinder.getInstance().classForName(name);
and here is the code for PlugableClassFinder class:
public class PlugableClassFinder {
private Set<ClassLoader> classLoaders = new HashSet<ClassLoader>();
public Class classForName(String name) throws ClassNotFoundException {
try {
ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
if ( contextClassLoader != null ) {
return contextClassLoader.loadClass(name);
}
}
catch ( Throwable t ) {
}
try {
return Class.forName(name);
} catch (ClassNotFoundException e) {
}
//now look into the registerred class loaders
for (ClassLoader classLoader : classLoaders) {
try {
return classLoader.loadClass(name);
} catch (ClassNotFoundException e) {
}
}
throw new ClassNotFoundException("Cannot find class: " + name);
}
public void registerClassLoader(ClassLoader classLoader) {
classLoaders.add(classLoader);
}
public void deregisterClassLoader(ClassLoader classLoader) {
classLoaders.remove(classLoader);
}
private static final PlugableClassFinder instance = new PlugableClassFinder();
public static PlugableClassFinder getInstance() {
return instance;
}
}
Now every bundle will register its class loader with PlugableClassFinder class.
Maybe hibernate should either allow plugging new class loaders to resolve classes or provide a hook o an interface that we can implement to replace the internal class resolving mechanism. For the moment our approach if working for us.
Regards
Behrang Javaherian
http://www.beyondng.com
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11 years, 10 months
[Hibernate-JIRA] Created: (HHH-5962) Custom POJO Loading strategy for cglib and javassist
by Ilya Samartsev (JIRA)
Custom POJO Loading strategy for cglib and javassist
----------------------------------------------------
Key: HHH-5962
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5962
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.6.1
Environment: Hibernate 3.6.1, PostgreSQL, OSGi
Reporter: Ilya Samartsev
I use hibernate in OSGi-enabled environment and have found a strange class-loading behaviour of the initializer proxies. The problem is that it's not possible to define simple domain-model OSGi bundles which have pojo-based classes to be enhanced by hibernate without importing org.hibernate.*, net.sf.cglib.proxy.*, javassist.util.proxy.*, etc.
Testing environment:
- A Model bundle with pojos and hibernate HBMs(they used by osgi-hibernate loader to enhance them). This bundle doesn't actually require any hibernate/cglib/javassist imports for the reason there are simple pojos in it.
/src/com/example/TestPojoModel.java
/META-INF/mappings/TestPojoModel.hbm.xml
/META-INF/MANIFEST.MF
Expected behaviour:
To have "clean" bundle with pojos without any additional imports(e.g. org.hibernate.* or cglib/javassist).
Enhance these classes without any errors.
Current behaviour:
These pojo-based model bundles require to import a lot of hibernate and cglib or javassist stuff to enhance these pojos. The problem is that hibernate uses the same classloader (from model bundle) to load both pojos and hibernate/codegeneration utility classes. Otherwise it crushes with ClassNotFoundException.
Code explanation:
Javassist ProxyFactory initialization:
org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer:
ProxyFactory factory = new ProxyFactory();
factory.setSuperclass( interfaces.length == 1 ? persistentClass : null );
factory.setInterfaces( interfaces );
factory.setFilter( FINALIZE_FILTER );
return factory.createClass();
How javassist loads classes by default:
javassist.util.proxy.ProxyFactory:
protected ClassLoader getClassLoader0() {
ClassLoader loader = null;
if (superClass != null && !superClass.getName().equals("java.lang.Object"))
loader = superClass.getClassLoader();
else if (interfaces != null && interfaces.length > 0)
...
}
return loader;
}
It actually uses the classloader of the persistent class.
My proposition:
To create advanced classloader for ProxyFactory which has custom behaviour:
1. Firstly it tries to load class using the classloader of the persistent class
2. Secondly it tries to use the classloader of the curent hibernate bundle (which definitely has access to its own hibernate classes and imports the classes of the codegeneration libraries)
final ClassLoader platformDelegatingClassLoader = new ClassLoader(persistentClass.getClassLoader()) {
private final ClassLoader platformClassLoader = getClass().getClassLoader();
// on loadClass() it tries to use parent's classloader(parent = persistentClass.getClassLoader() - from the constructor)
// if loadClass() didn't find class it tries to findClass() which is actually overridden to use current context's getClass().getClassLoader()
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
return platformClassLoader.loadClass(name);
}
};
ProxyFactory factory = new ProxyFactory() {
@Override
protected ClassLoader getClassLoader() {
return platformDelegatingClassLoader;
}
};
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11 years, 10 months
[Hibernate-JIRA] Created: (HHH-3441) Null pointer exception on org.hibernate.type.AbstractType.getHashCode(AbstractType.java:112)
by DEROUET (JIRA)
Null pointer exception on org.hibernate.type.AbstractType.getHashCode(AbstractType.java:112)
--------------------------------------------------------------------------------------------
Key: HHH-3441
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3441
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Environment: Hibernate 3.25., Oracle 10g, Spring 2.5.5
Reporter: DEROUET
Priority: Blocker
The issue concerns a problem already signaled in different forums, and I decided to report it in JIRA, because many people have this same problem and after days and days of work around, the solutions possibles are heavy or dangerous for a database integrity (for example remove a non-nullability constraint...).
Here it is the problem a previous forum participant had perfectly summarized (see http://opensource.atlassian.com/projects/hibernate/browse/HHH-2326):
A null pointer exception is thrown when:
a) we have a composite key with one of the attributes of the key being an FK to another persistent class.
b) The other persistent class has an ID field whose value is being generated.
c) The instance of the other persistent class is transient (does not yet have an ID)
We do not get the null pointer if we explicitly set the ID (generator=assigned)
Here it is the failure trace:
-->
-->
java.lang.NullPointerException
at org.hibernate.type.AbstractType.getHashCode(AbstractType.java:112)
at org.hibernate.type.AbstractType.getHashCode(AbstractType.java:120)
at org.hibernate.type.EntityType.getHashCode(EntityType.java:279)
at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:189)
at org.hibernate.engine.EntityKey.generateHashCode(EntityKey.java:104)
at org.hibernate.engine.EntityKey.<init>(EntityKey.java:48)
at org.hibernate.engine.StatefulPersistenceContext.getDatabaseSnapshot(StatefulPersistenceContext.java:240)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:189)
at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:512)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:80)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:495)
at org.springframework.orm.hibernate3.HibernateTemplate$16.doInHibernate(HibernateTemplate.java:747)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:419)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate(HibernateTemplate.java:744)
at eu.cec.argus.bcm.dao.businessContinuityEvent.BusinessContinuityEventDAOImpl.createBCEvent(BusinessContinuityEventDAOImpl.java:39)
at eu.cec.argus.bcm.dao.businessContinuityEvent.BusinessContinuityEventDAOTest.testSaveBcEventAndRelatedMessagesAndMeetings(BusinessContinuityEventDAOTest.java:127)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.test.context.junit4.SpringTestMethod.invoke(SpringTestMethod.java:198)
at org.springframework.test.context.junit4.SpringMethodRoadie.runTestMethod(SpringMethodRoadie.java:274)
at org.springframework.test.context.junit4.SpringMethodRoadie$2.run(SpringMethodRoadie.java:207)
at org.springframework.test.context.junit4.SpringMethodRoadie.runBeforesThenTestThenAfters(SpringMethodRoadie.java:254)
at org.springframework.test.context.junit4.SpringMethodRoadie.runWithRepetitions(SpringMethodRoadie.java:234)
at org.springframework.test.context.junit4.SpringMethodRoadie.runTest(SpringMethodRoadie.java:204)
at org.springframework.test.context.junit4.SpringMethodRoadie.run(SpringMethodRoadie.java:146)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.invokeTestMethod(SpringJUnit4ClassRunner.java:151)
at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:26)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:36)
at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Here they are my classes:
@Entity
@Table(name = "BCM_BC_EVENT")
@IdClass(BusinessContinuityEvent.BusinessContinuityEventId.class)
@SequenceGenerator(name = "Generator.BusinessContinuityEvent", sequenceName = "SEQ_BCM_BC_EVENT")
public class BusinessContinuityEvent implements Serializable {
@Embeddable
public static class BusinessContinuityEventId implements Serializable {
private static final long serialVersionUID = 3513299649110908676L;
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "Generator.BusinessContinuityEvent")
@Column(name = "BCE_ID", insertable = false, updatable = false, nullable = false)
private Long id;
@ManyToOne(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE})
@Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
@JoinColumn(name = "EVE_ID", referencedColumnName = "EVE_ID", nullable = false)
private Event event;
public BusinessContinuityEventId(){
}
public BusinessContinuityEventId(Long id, Event event) {
this.id = id;
this.event = event;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Event getEvent() {
return event;
}
public void setEvent(Event event) {
this.event = event;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof BusinessContinuityEventId) {
BusinessContinuityEventId other = (BusinessContinuityEventId) obj;
return this.event.getId().equals(other.event.getId())
&& this.id.equals(other.id);
}
return false;
}
@Override
public int hashCode() {
return this.event.getId().hashCode() ^ this.id.hashCode();
}
}
private static final long serialVersionUID = 5385009048448590115L;
@Id
private Long id;
@Id
private Event event;
@OneToMany(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE})
@Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
@JoinColumns({
@JoinColumn(name = "BCE_ID", referencedColumnName = "BCE_ID"),
@JoinColumn(name = "EVE_ID", referencedColumnName = "EVE_ID")})
private List<Message> messages;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Event getEvent() {
return event;
}
public void setEvent(Event event) {
this.event = event;
}
public List<Message> getMessages() {
return messages;
}
public void setMessages(List<Message> messages) {
this.messages = messages;
}
}
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11 years, 10 months
[Hibernate-JIRA] Created: (HSHARDS-57) For a better "virtual shards" support!
by Colbert Philippe (JIRA)
For a better "virtual shards" support!
--------------------------------------
Key: HSHARDS-57
URL: http://opensource.atlassian.com/projects/hibernate/browse/HSHARDS-57
Project: Hibernate Shards
Issue Type: Improvement
Affects Versions: 3.0.0.Beta2
Environment: Windows XP
Reporter: Colbert Philippe
Assignee: Max Ross
The current implementation of virtual shards leaves a lot to be desired when used in big corporate applications.
A better way to model shards, is to identify a virtual shard by a pairing of "some name" + "an index" (example: Clients, 11). The name plays a role similar to namespaces. The index is always zero based and valid only within the namespace. There can be many shard namespaces with unique names. A configuration file (possibly XML) will map each virtual shard to a single physical shard. It's a simple mapping strategy. The mapping can allow overlaps of virtual shards into a single physical shard. This type of naming can make things more clear and easier to manage on the long-run.
The big advantage to virtual shards over physical shards is that virtual shards can be easily persisted to file or database and retrieved again and still remain valid. Any change to the shard structure is fully controlled by the shard configuration file, without modifications to the persisted representation of the shard. This way the code can evolve separately from the physical shard architecture.
With this kind of virtual shard, top-of-tree classes will map to a single shard namespace. The object will reside in any of the virtual shard indexes associated with the shard namespace. The resolution strategy becomes very simple because the set of shard indexes will be returned.
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11 years, 10 months
[Hibernate-JIRA] Created: (HHH-3464) SimpleExpression.ignoreCase uses SQL server lowercase function for left part and JAVA lowercase function for right part of expression
by Vitaliy Tymchyshyn (JIRA)
SimpleExpression.ignoreCase uses SQL server lowercase function for left part and JAVA lowercase function for right part of expression
-------------------------------------------------------------------------------------------------------------------------------------
Key: HHH-3464
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3464
Project: Hibernate3
Issue Type: Bug
Components: query-criteria
Affects Versions: 3.2.6
Environment: tried with PostgreSQL
Reporter: Vitaliy Tymchyshyn
Priority: Minor
When using SimpleExpression.ignoreCase (e.g. Restrictions.eq().ignoreCase, hibernate makes 'lower(field)=?' SQL expression, passing lowercased strings to '?' parameter. This may produce unpredictable results depending on Database server lower implementation and current JAVA locale (see JDK javadoc).
For example, I've tried with '\u0130' character as in JDK JavaDoc.
Postgresql produces:
unhappy=> select lower('İ');
lower
-------
i̇
(1 row)
unhappy=> select char_length(lower('İ'));
char_length
-------------
2
(1 row)
While Java with default locale produces single-character 'i̇'. Of course the restriction will not work - it can not find 'İ' in database.
I'd recommend to use 'lower(field)=lower(?)' to use same lower casing function for both parts of expression.
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11 years, 10 months
[Hibernate-JIRA] Created: (HHH-2808) CLONE -Impossible to define caching for a subclass's collection in hibernate.cgf.xml
by Sebastien Blind (JIRA)
CLONE -Impossible to define caching for a subclass's collection in hibernate.cgf.xml
-------------------------------------------------------------------------------------
Key: HHH-2808
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2808
Project: Hibernate3
Issue Type: Bug
Components: caching (L2)
Affects Versions: 3.2.5
Environment: Hibernate 3.2.5
Sybase
Reporter: Sebastien Blind
Basically, hibernate allows to define <cache usage="transactional"/> inside the subclass mapping, i.e.
<subclass name="SubClass" extends="BaseClass" discriminator-value="xxx">
<bag name="subClassLinks" lazy="false" inverse="true" batch-size="100">
<cache usage="transactional" region="xxx"/>
<key column="xxx" not-null="true"/>
<one-to-many class="xxx"/>
</bag>
<join table="xxx">
</join>
</subclass>
but it's not allowed to do the same using <collection-cache collection="subClass.myCollection" region="xxx" usage="transactional"/>.
It throws:
Exception in thread "main" org.hibernate.MappingException: Cannot cache an unknown collection: subClass.myCollection
at org.hibernate.cfg.Configuration.setCollectionCacheConcurrencyStrategy(Configuration.java:1984)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1568)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1534)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1508)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1428)
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11 years, 11 months