[Hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1293) java.lang.NoSuchMethodError: <persistent class>.getHibernateLazyInitializer()

[Scott M. (JIRA) <no...@at...>]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1293?page=comments#action_23625 ] 

Scott Marlow commented on HHH-1293:
-----------------------------------

With regard to classloader, it will help me think about that by laying out the steps of the current code and the patched code.

With respect to the cglib support, we currently return a class from getProxyFactory() and create an instance from that class inside of getProxy() via the newInstance static class method.  The class definition is loaded inside of getProxyFactory() and used within getProxy().

With respect to the proposed patch, we will load the factory class in getProxyFactory() and also create an instance from that class inside of getProxyFactory().  We will return the Factory instance from getProxyFactory(), such that all class loading should occur within getProxyFactory().  In getProxy(), we will use the passed Factory instance to create an instance of the proxy class.  

To answer the raised point about classloader, the question that I need to investigate is whether the proxy class was loaded during getProxyFactory() or later when newInstance(Callback[]) is invoked during the getProxy().

With regard to the cglib case versus javassist.  I need to investigate the difference more.

> java.lang.NoSuchMethodError: <persistent class>.getHibernateLazyInitializer()
> -----------------------------------------------------------------------------
>
>          Key: HHH-1293
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1293
>      Project: Hibernate3
>         Type: Bug

>     Versions: 3.1.1
>     Reporter: Andreas Schildbach
>     Assignee: Scott Marlow
>     Priority: Blocker
>      Fix For: 3.2.0.ga
>  Attachments: CGLIBLazyInitializer.patch, CGLIBLazyInitializer.patch, hibernate3.jar, manysessions.tgz
>
>
> As documented in
> http://forum.hibernate.org/viewtopic.php?t=940119
> some people (including me) are getting this exception with the final release of Hibernate 3.1:
> java.lang.NoSuchMethodError: de.schildbach.game.integration.HibernateGamePlayer.getHibernateLazyInitializer()Lorg/hibernate/proxy/LazyInitializer;
>         at de.schildbach.game.integration.HibernateGamePlayer$$EnhancerByCGLIB$$afecb986.getHibernateLazyInitializer(<generated>)
>         at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:274)
>         at org.hibernate.type.ManyToOneType.assemble(ManyToOneType.java:177)
>         at org.hibernate.type.TypeFactory.assemble(TypeFactory.java:398)
>         at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:96)
>         at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:82)
>         at org.hibernate.event.def.DefaultLoadEventListener.assembleCacheEntry(DefaultLoadEventListener.java:520)
>         at org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:474)
>         at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:328)
>         at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:123)
>         at org.hibernate.event.def.DefaultLoadEventListener.returnNarrowedProxy(DefaultLoadEventListener.java:202)
>         at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:169)
>         at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
>         at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:869)
>         at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:838)
>         at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
>         at org.hibernate.type.ManyToOneType.assemble(ManyToOneType.java:177)
>         at org.hibernate.collection.PersistentList.initializeFromCache(PersistentList.java:378)
>         at org.hibernate.cache.entry.CollectionCacheEntry.assemble(CollectionCacheEntry.java:35)
>         at org.hibernate.event.def.DefaultInitializeCollectionEventListener.initializeCollectionFromCache(DefaultInitializeCollectionEventListener.java:130)
>         at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:48)
>         at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1627)
>         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)
> The exception varies with the actual persistent class in use. Most people seem to be using JDK 1.5 and Linux. Some reports say that the exception does not happen from the very start of the application, but it takes "several invocations"/"some time" until it appear, but then it appears very often.

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