Jimmy dong [http://community.jboss.org/people/jimmy.dongjia] created the discussion "Re: Help!After replacing H2 to mysql,getting errors in the process tab!" To view the discussion, visit: http://community.jboss.org/message/642130#642130 -------------------------------------------------------------- Hi Demian! When I set hibernate.hbm2ddl.auto=create  to update, after I restart  HT server, the HT server can't run , error as follow: [javac] /usr/local/jbpm-installer/build.xml:500: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds      [java] Exception in thread "main" javax.persistence.RollbackException: Error while commiting the transaction      [java]  at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:71)      [java]  at org.jbpm.task.service.TaskServiceSession.doOperationInTransaction(TaskServiceSession.java:820)      [java]  at org.jbpm.task.service.TaskServiceSession.persistInTransaction(TaskServiceSession.java:786)      [java]  at org.jbpm.task.service.TaskServiceSession.addUser(TaskServiceSession.java:69)      [java]  at org.jbpm.DemoTaskService.main(Unknown Source)      [java] Caused by: org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update      [java]  at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94)      [java]  at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)      [java]  at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)      [java]  at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)      [java]  at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)      [java]  at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)      [java]  at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)      [java]  at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)      [java]  at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)      [java]  at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)      [java]  at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:54)      [java]  ... 4 more      [java] Caused by: java.sql.BatchUpdateException: Duplicate entry 'Jane Austin' for key 'PRIMARY'      [java]  at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2028)      [java]  at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1451)      [java]  at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)      [java]  at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)      [java]  ... 12 more      [java] Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'Jane Austin' for key 'PRIMARY'      [java]  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)      [java]  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)      [java]  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)      [java]  at java.lang.reflect.Constructor.newInstance(Constructor.java:513)      [java]  at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)      [java]  at com.mysql.jdbc.Util.getInstance(Util.java:386)      [java]  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)      [java]  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)      [java]  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)      [java]  at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)      [java]  at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)      [java]  at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)      [java]  at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)      [java]  at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2427)      [java]  at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1980)      [java]  ... 15 more      [java] Java Result: 1 BUILD SUCCESSFUL Total time: 30 seconds [root@localhost jbpm-installer]#  -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/642130#642130] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]