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Caused by: org.hibernate.exception.SQLGrammarException: could not execute query

Caused by: org.hibernate.exception.SQLGrammarException: could not execute query exception we also got in the process of improving application performance. Because, we have upgraded MySQL-connector-java-3.1.10.jar to MySQL-connector-java-5.1.36.jar. After upgrading to the higher version, my application not at all connecting with the Data Base Schema. Because, In my application we are using JNDI data source connection. As per JNDI, MySQL connector jar will not support after MySQL-connector-java-5.1.6.jar. We are using MySQL server version as 5.1.

So, I downgraded from MySQL-connector-java-5.1.36.jar to MySQL-connector-java-5.1.6.jar version. Now, Application getting loading Database Schema and started running the application. But, still I am getting the problem in some scenarios where query is not matching with proper MySQL version. Hence, I am again downgraded MySQL jar from MySQL-connector-java-5.1.6.jar to MySQL-connector-java-5.0.8.jar. Now, there are no issues in my application.

Exception details are:
Error Log is: Exception while dispatching incoming RPC call   com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.Boolean order.client.service.WorkOrderService.isBillingRateExist(int,int,int,float,int)' threw an unexpected exception: java.lang.RuntimeException: Hibernate Exception while updating workorder component by component id
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:385)
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:368)
at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:205)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.thbs.mis.filter.ServletFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Unknown Source) 
Caused by: java.lang.RuntimeException: Hibernate Exception while updating workorder component by component id
at com.order.server.impl.OrderServiceImpl.isBillingRateExist(OrderServiceImpl.java:1343)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:174)
... 25 more
Caused by: org.hibernate.exception.SQLGrammarException: could not execute query
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:67)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.loader.Loader.doList(Loader.java:2223)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
at org.hibernate.loader.Loader.list(Loader.java:2099)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:289)
at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1695)
at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152)
at com.order.server.impl.OrderServiceImpl.isBillingRateExist(OrderServiceImpl.java:1332)
... 30 more
Caused by: java.sql.SQLException: Column 'pk_billing_id' not found.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
at com.mysql.jdbc.ResultSetImpl.findColumn(ResultSetImpl.java:1093)
at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2734)
at org.jboss.resource.adapter.jdbc.WrappedResultSet.getInt(WrappedResultSet.java:698)
at org.hibernate.type.IntegerType.get(IntegerType.java:28)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:163)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:189)
at org.hibernate.loader.custom.CustomLoader$ScalarResultColumnProcessor.extract(CustomLoader.java:474)
at org.hibernate.loader.custom.CustomLoader$ResultRowProcessor.buildResultRow(CustomLoader.java:420)
at org.hibernate.loader.custom.CustomLoader.getResultColumnOrRow(CustomLoader.java:317)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:606)
at org.hibernate.loader.Loader.doQuery(Loader.java:701)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.doList(Loader.java:2220)
... 37 more

The reason behind getting the above exception is:
1. Your query/criteria might not getting reaching version of MySQL running in the server.
2. It might be depending on MySQL-connector-java-<version>.jar
3. You might upgraded/degraded connector jar in the application lib, might be missing in the server lib.
4. Your java class might be using MySQL reserved words like, Using....
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