play1.2.7 JPA error

execute JPA.em().createNativeQuery(sql,beanClass) method exception .this question is very strange，
sometimes it happens sometimes it's okay.

JPA error
A JPA error occurred (Cannot commit): org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update

play.exceptions.JPAException: Cannot commit
at play.db.jpa.JPAPlugin.closeTx(JPAPlugin.java:419)
at play.db.jpa.JPAPlugin.afterInvocation(JPAPlugin.java:350)
at play.plugins.PluginCollection.afterInvocation(PluginCollection.java:479)
at play.Invoker$Invocation.after(Invoker.java:225)
at play.Invoker$Invocation.run(Invoker.java:279)
at Invocation.HTTP Request(Play!)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1389)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1317)
at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:81)
at play.db.jpa.JPAPlugin.closeTx(JPAPlugin.java:406)
... 5 more
Caused by: org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:185)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:345)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:76)
... 6 more
Caused by: java.sql.BatchUpdateException: Table 'xxx.xxx' doesn't exist
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2045)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1468)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
... 14 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'xxx.xxx' doesn't exist
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2683)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2144)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2444)
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1997)
... 17 more

Start with the reported call to JPA.em().createNativeQuery(sql, beanClass) and the JPAPlugin.java transaction paths at lines 406 and 419. Reproduce the commit failure with the provided MySQL stack trace, then determine why table 'xxx.xxx' is unavailable intermittently; done requires an agreed cause and a verified resolution.