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I've set up a simple many-to-many relationship account : role with Hibernate but when I try to save an account in a unit test after it has had its role added I get an UnsupportedOperationException: java.lang.UnsupportedOperationException at java.util.AbstractList.remove(AbstractList.java:144) at java.util.AbstractList$Itr.remove(AbstractList.java:360) at java.util.AbstractList.removeRange(AbstractList.java:559) at java.util.AbstractList.clear(AbstractList.java:217) at org.hibernate.type.CollectionType.replaceElements(CollectionType.java:502) at org.hibernate.type.CollectionType.replace(CollectionType.java:582) at org.hibernate.type.TypeHelper.replace(TypeHelper.java:178) at org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:563) at org.hibernate.event.def.DefaultMergeEventListener.entityIsPersistent(DefaultMergeEventListener.java:288) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:261) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:84) at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:867) at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:851) at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:855) at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:686) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240) at $Proxy33.merge(Unknown Source) at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save

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