Dave Chen [http://community.jboss.org/people/javatwo] created the discussion "The cause exception lost in the exception chain" To view the discussion, visit: http://community.jboss.org/message/535442#535442 -------------------------------------------------------------- public void commit() {   try {      userTransaction.commit();    } catch (Throwable t) {      t.printStackTrace();    } } In case of org.hibernate.exception.ConstraintViolationException, on the terminal the error message: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not delete: [mypackage.Foo#1]         at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)         at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:513)         at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:101)         at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:269)         at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:89)         at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)         at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1423)         at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:137)         at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75)         at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:162) ... Caused by: org.hibernate.exception.ConstraintViolationException: could not delete: [package.Foo#1]         at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94)         at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)         at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2569)         at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2725)         at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:97)         at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)         at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)         at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172)         at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)         at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)         at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)         at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)         at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:504)         ... 58 more Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails ...         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)         at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)         at java.lang.reflect.Constructor.newInstance(Constructor.java:513)         at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)         at com.mysql.jdbc.Util.getInstance(Util.java:381)         at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)         at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)         at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3515)         at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)         at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1951)         at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)         at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2554)         at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1761)         at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2046)         at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1964)         at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1949)         at com.mysql.jdbc.jdbc2.optional.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:874)         at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:365)         at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2551)         ... 68 more but the caught Throwable is javax.transaction.RollbackException, it did not have ConstraintViolation information. We like to show the constraint violation information to users. How to get the real cuase of the exception?  we use JBOSS 5.1.0GA. Thanks! Dave -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/535442#535442] Start a new discussion in Beginner's Corner at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]