Hi

I've got an odd problem.
We're Using Hibernate 3 and Spring 2 on weblogic 9.1 and an Oracle 10g backend and I have come upon a strange problem.

When making a call to our srvices layer to persist an object I get this error
[code]java.lang.ClassCastException: java.util.ArrayList
at org.hibernate.type.SetType.wrap(SetType.java:39)
at org.hibernate.event.def.WrapVisitor.processArrayOrNewCollection(WrapVisitor.java:84)
at org.hibernate.event.def.WrapVisitor.processCollection(WrapVisitor.java:51)
at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:101)
at org.hibernate.event.def.WrapVisitor.processValue(WrapVisitor.java:98)
at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:55)
at org.hibernate.event.def.DefaultFlushEntityEventListener.wrapCollections(DefaultFlushEntityEventListener.java:178)
at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:111)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:195)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1009)
at org.springframework.orm.hibernate3.HibernateTemplate$27.doInHibernate(HibernateTemplate.java:793)
at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:366)
at org.springframework.orm.hibernate3.HibernateTemplate.flush(HibernateTemplate.java:791)
at uk.co.anm.london.persistence.dao.hibernate.UserListingDAO.saveOrMerge(UserListingDAO.java:52)
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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:287)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:181)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)
at org.springframework.orm.hibernate3.HibernateInterceptor.invoke(HibernateInterceptor.java:97)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)
at $Proxy100.saveOrMerge(Unknown Source)
at uk.co.anm.london.services.ListingsServices.saveOrUpdateUserListing(ListingsServices.java:531)[/code]

I read back on posts about incorrect mappings (Arraylist = > Set) and worked out it is nothing to do with the object I am attempting to persist.
I put in a flush in the object's DAO BEFORE it tries to persist the object and the flush triggers the error.

Is there an easy way I can look inside the session to see what the flush is attempting to do? All I can tell is that it shouldn't be trying to persist my UserListing Object as the code hasn't called the save method yet.

Many Thanks

Charlie[/code]

Switched to debug and it told me what it is trying - Still not sure why it failed but that's another story (and somebody else's problem as well as it is their code).