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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(	at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(	at org.hibernate.jdbc.AbstractBatcher.executeBatch(	at org.hibernate.engine.ActionQueue.executeActions(	at org.hibernate.engine.ActionQueue.executeActions(	at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(	at org.hibernate.impl.SessionImpl.flush(	at UnidirectionalOneToManyRemoveFromListBug.main(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at com.intellij.rt.execution.application.AppMain.main(