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java.lang.UnsupportedOperationException at java.util.Collections$UnmodifiableCollection.clear(Collections.java:1037) at org.hibernate.collection.PersistentSet.clear(PersistentSet.java:247) at org.hibernate.type.CollectionType.replaceElements(CollectionType.java:404) at org.hibernate.type.CollectionType.replace(CollectionType.java:449) at org.hibernate.type.TypeFactory.replace(TypeFactory.java:437) at org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:282) at org.hibernate.event.def.DefaultMergeEventListener.entityIsPersistent(DefaultMergeEventListener.java:132) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:105) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:51) 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.test.annotations.manytomany.ManyToManyTest.testUnmodifiableCollection(ManyToManyTest.java:102) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at org.hibernate.test.annotations.TestCase.runTest(TestCase.java:67) at com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:32) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)