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java.lang.UnsupportedOperationException: 	at java.util.AbstractList.remove(AbstractList.java:161)	at java.util.AbstractList$Itr.remove(AbstractList.java:374)	at java.util.AbstractList.removeRange(AbstractList.java:571)	at java.util.AbstractList.clear(AbstractList.java:234)	at org.hibernate.type.CollectionType.replaceElements(CollectionType.java:543)	at org.hibernate.type.CollectionType.replace(CollectionType.java:697)	at org.hibernate.type.TypeHelper.replace(TypeHelper.java:193)	at org.hibernate.event.internal.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:407)	at org.hibernate.event.internal.DefaultMergeEventListener.entityIsPersistent(DefaultMergeEventListener.java:219)	at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:192)	at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:85)	at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:876)	at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:858)	at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:863)	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:1196)