Hi all and sorry in advance for this post but I've spent way too much time going around in circles so I'm hoping someone could shed a light on it here for me. I updated a webapp on Tomcat and I'm getting the following error which didn't exist on the previous version. Though I am quite confident that the part of code I modifed isn't to blame as I have tested the app on two different dev servers.

The production server is configured thus: CentOS 5.4 virtual server with tomcat 5.5.23 running mysql 5.0.77.
The two dev servers are: Windows XP SP2 running tomcat 5.5.23 with mysql 5.1.49
                         Mac OSX 10.6.6 Running tomcat 6 with mysql 5.1.51

The application was developed using struts (1.1 as far as I can gather) with hibernate 3 as the peristence layer. It only fails on the production server for some reason I can't fathom. I'd like to draw your attention to the java.sql.SQLException near the bottom. After some long searching I found this but because it was posted years ago (about 1 year before development started on this app I'm sure Hibernate has evolved from that version. as I can't find a way of implementing his solution. I use Eclipse Helios as an IDE. Thanks in advance for taking your time to read this, to all who manage to reply.

javax.servlet.ServletException: org.hibernate.exception.SQLGrammarException: could not execute query
 at fr.company.action.login.LoginAction.execute(LoginAction.java:219)
 at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
 at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
 at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
 at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
 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:269)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
 at fr.company.util.EncodingFilter.doFilter(EncodingFilter.java:37)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:113)
 at java.lang.Thread.run(Thread.java:636)


javax.servlet.ServletException: org.hibernate.exception.SQLGrammarException: could not execute query
 at fr.company.action.login.LoginAction.execute(LoginAction.java:219)
 at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
 at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
 at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
 at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
 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:269)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
 at fr.company.util.EncodingFilter.doFilter(EncodingFilter.java:37)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:113)
 at java.lang.Thread.run(Thread.java:636)
java.lang.Exception: org.hibernate.exception.SQLGrammarException: could not execute query
 at fr.company.dao.GenericDAO.findOne(GenericDAO.java:204)
 at fr.company.dao.UserDAO.findOneUser(UserDAO.java:146)
 at fr.company.service.UserPeer.logUser(UserPeer.java:72)
 at fr.company.action.login.LoginAction.execute(LoginAction.java:127)
 at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
 at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
 at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
 at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
 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:269)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
 at fr.company.util.EncodingFilter.doFilter(EncodingFilter.java:37)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:113)
 at java.lang.Thread.run(Thread.java:636)
Caused by: org.hibernate.exception.SQLGrammarException: could not execute query
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:65)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
 at org.hibernate.loader.Loader.doList(Loader.java:2153)
 at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
 at org.hibernate.loader.Loader.list(Loader.java:2024)
 at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:369)
 at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:300)
 at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:153)
 at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1128)
 at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
 at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:749)
 at fr.company.dao.GenericDAO.findOne(GenericDAO.java:198)
 ... 26 more
Caused by: java.sql.SQLException: Unknown column 'user0_1_.poloSize' in 'field list'
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2928)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1571)
 at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1666)
 at com.mysql.jdbc.Connection.execSQL(Connection.java:2994)
 at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:936)
 at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1030)
 at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:76)
 at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:139)
 at org.hibernate.loader.Loader.getResultSet(Loader.java:1669)
 at org.hibernate.loader.Loader.doQuery(Loader.java:662)
 at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
 at org.hibernate.loader.Loader.doList(Loader.java:2150)
 ... 35 more