useless stacktrace ------------------ Key: HIBERNATE-104 URL: https://issues.jboss.org/browse/HIBERNATE-104 Project: Hibernate Integration Issue Type: Bug Environment: jboss-4.2.2.GA, linux 32bit Reporter: arne anka Assignee: Steve Ebersole when trying entityManager.merge(myUser); entityManager.flush(); i get a very long list of recurrent stacktraces. it boils down to two messages: Caused by: org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of my.class.roleId at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:171) at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:183) at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3591) at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:3307) at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:181) at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:218) at org.hibernate.type.EntityType.getIdentifier(EntityType.java:397) at org.hibernate.type.EntityType.replace(EntityType.java:253) at org.hibernate.type.CollectionType.replaceElements(CollectionType.java:451) at org.hibernate.type.Collecti 14:46:07,362 INFO [STDOUT] onType.replace(CollectionType.java:518) at org.hibernate.type.TypeFactory.replace(TypeFactory.java:482) at org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:340) at org.hibernate.event.def.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:267) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:120) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:53) at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:677) at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:661) at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:665) at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:227) ... 74 more and Caused by: java.lang.IllegalArgumentException: java.lang.ClassCastException@661744 at sun.reflect.GeneratedMethodAccessor2266.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145) ... 92 more the property my.class.roleId is defined as Integer, setter and getter expect or return an Integer. i can't see, what type hibernate expects as argument and i can't see in what type hibernate tries to cast. - why does the stacktrace not mention the argument type hibernate expects? - why does the stacktrace not mention in which type hibernate tries to cast? with it's current level of null-information ist that _very_ long, confusing and time consuming stacktrace worse then useless. i am completely unable to deduce any way to remedy a possible bug in my code or circumvent a possible bug in hibernate.