trouble updating xWiki

Hello, I just updated from JVM 1.5.0_05 Tomcat 5.0.28 xWiki 0.9.543 to JVM 1.5.0_06 Tomcat 5.5.16 xWiki 0.9.840 with MySql *4.0.24 *under Windows XP. Then I can read the previous xwiki database, but I can't update it. As soon as I try to save a change I get the error below. Any idea? Regards Pierre Raoul [...] INFO: Server startup in 71000 ms 20:43:13,046 WARN http-8080-Processor25 http://localhost:8080/xwiki/bin/edit/Main/InstallerxWiki Configurator:configure:126 - No configuration found. Configuring ehcache from ehcache-failsafe.xml found in the classpath: jar:file:/C:/Program%20File s/Apache%20Software%20Foundation/apache-tomcat-5.5.16/webapps/xwiki/WEB-INF/lib/ehcache-1.1.jar!/ehcache-failsafe.xml 20:43:24,000 ERROR http-8080-Processor25 http://localhost:8080/xwiki/bin/edit/Main/InstallerxWiki XWikiHibernateStore:update Schema:177 - Schema update for wiki xwiki 21:12:08,750 WARN http-8080-Processor25 http://localhost:8080/xwiki/bin/save/Main/InstallerxWiki XWikiStatsServiceImpl:addC ookie:474 - Setting cookie 6PCUESQ34SBN5NBQIZZNWEQSFRPFFENE for name visitid with domain null and path / and maxage 1333574 21:12:08,859 ERROR http-8080-Processor25 http://localhost:8080/xwiki/bin/save/Main/InstallerxWiki AssertionFailure:<init>:22 - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session) org.hibernate.AssertionFailure: possible nonthreadsafe access to session at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:68) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:223) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:274) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:726) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:320) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86) at com.xpn.xwiki.store.XWikiHibernateStore.endTransaction(XWikiHibernateStore.java:350) at com.xpn.xwiki.store.XWikiHibernateStore.deleteXWikiCollection(XWikiHibernateStore.java:982) at com.xpn.xwiki.stats.impl.XWikiStatsServiceImpl.notify(XWikiStatsServiceImpl.java:209) at com.xpn.xwiki.notify.XWikiActionRule.verify(XWikiActionRule.java:51) at com.xpn.xwiki.notify.XWikiNotificationManager.verify(XWikiNotificationManager.java:93) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:268) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664 ) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) com.xpn.xwiki.XWikiException: Error number 3213 in 3: Exception while deleting object XWiki.Admin Wrapped Exception: possible nonthreadsafe access to session at com.xpn.xwiki.store.XWikiHibernateStore.deleteXWikiCollection(XWikiHibernateStore.java:986) at com.xpn.xwiki.stats.impl.XWikiStatsServiceImpl.notify(XWikiStatsServiceImpl.java:209) at com.xpn.xwiki.notify.XWikiActionRule.verify(XWikiActionRule.java:51) at com.xpn.xwiki.notify.XWikiNotificationManager.verify(XWikiNotificationManager.java:93) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:268) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664 ) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) Wrapped Exception: org.hibernate.AssertionFailure: possible nonthreadsafe access to session at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:68) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:223) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:274) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:726) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:320) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86) at com.xpn.xwiki.store.XWikiHibernateStore.endTransaction(XWikiHibernateStore.java:350) at com.xpn.xwiki.store.XWikiHibernateStore.deleteXWikiCollection(XWikiHibernateStore.java:982) at com.xpn.xwiki.stats.impl.XWikiStatsServiceImpl.notify(XWikiStatsServiceImpl.java:209) at com.xpn.xwiki.notify.XWikiActionRule.verify(XWikiActionRule.java:51) at com.xpn.xwiki.notify.XWikiNotificationManager.verify(XWikiNotificationManager.java:93) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:268) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664 ) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) 21:12:09,062 WARN http-8080-Processor25 RequestUtils:createActionForm:177 - No FormBeanConfig found under 'view' 21:12:13,546 WARN Finalizer JDBCContext:finalize:333 - afterTransactionCompletion() was never called 21:12:14,718 WARN http-8080-Processor25 http://localhost:8080/xwiki/bin/view/Main/InstallerxWiki XWikiStatsServiceImpl:addC ookie:474 - Setting cookie 42GLIZ4WELYCD0NATIHUEUYLBLNALH73 for name visitid with domain null and path / and maxage 1333568 21:12:14,718 WARN http-8080-Processor25 http://localhost:8080/xwiki/bin/view/Main/InstallerxWiki XWikiStatsServiceImpl:find Visit:314 - Found visit with cookie T6ESE8E4VJTZCFROAE9ZTIBXLBG8KYUR in session 8DEA74E3BA006C10D516BF9A9EC8B299 for request with cookie 42GLIZ4WELYCD0NATIHUEUYLBLNALH73 21:12:14,734 ERROR http-8080-Processor25 http://localhost:8080/xwiki/bin/view/Main/InstallerxWiki AssertionFailure:<init>:22 - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session) org.hibernate.AssertionFailure: possible nonthreadsafe access to session at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:68) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:223) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:274) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:726) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:320) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86) at com.xpn.xwiki.store.XWikiHibernateStore.endTransaction(XWikiHibernateStore.java:350) at com.xpn.xwiki.store.XWikiHibernateStore.deleteXWikiCollection(XWikiHibernateStore.java:982) at com.xpn.xwiki.stats.impl.XWikiStatsServiceImpl.notify(XWikiStatsServiceImpl.java:209) at com.xpn.xwiki.notify.XWikiActionRule.verify(XWikiActionRule.java:51) at com.xpn.xwiki.notify.XWikiNotificationManager.verify(XWikiNotificationManager.java:93) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:268) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664 ) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) com.xpn.xwiki.XWikiException: Error number 3213 in 3: Exception while deleting object XWiki.Admin Wrapped Exception: possible nonthreadsafe access to session at com.xpn.xwiki.store.XWikiHibernateStore.deleteXWikiCollection(XWikiHibernateStore.java:986) at com.xpn.xwiki.stats.impl.XWikiStatsServiceImpl.notify(XWikiStatsServiceImpl.java:209) at com.xpn.xwiki.notify.XWikiActionRule.verify(XWikiActionRule.java:51) at com.xpn.xwiki.notify.XWikiNotificationManager.verify(XWikiNotificationManager.java:93) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:268) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664 ) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) Wrapped Exception: org.hibernate.AssertionFailure: possible nonthreadsafe access to session at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:68) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:223) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:274) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:726) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:320) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86) at com.xpn.xwiki.store.XWikiHibernateStore.endTransaction(XWikiHibernateStore.java:350) at com.xpn.xwiki.store.XWikiHibernateStore.deleteXWikiCollection(XWikiHibernateStore.java:982) at com.xpn.xwiki.stats.impl.XWikiStatsServiceImpl.notify(XWikiStatsServiceImpl.java:209) at com.xpn.xwiki.notify.XWikiActionRule.verify(XWikiActionRule.java:51) at com.xpn.xwiki.notify.XWikiNotificationManager.verify(XWikiNotificationManager.java:93) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:268) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664 ) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) 21:12:23,906 WARN Finalizer JDBCContext:finalize:333 - afterTransactionCompletion() was never called