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Could not execute JDBC batch update
java.sql.BatchUpdateException: Duplicate key or integrity constraint violation,  message from server: "Duplicate entry '5' for key 2"	at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1461)	at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:58)	at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195)	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:230)	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:143)	at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:296)	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:980)	at UnidirectionalOneToManyRemoveFromListBug.main(UnidirectionalOneToManyRemoveFromListBug.java:27)	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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:86)