Error when saving documents

I got the below error when saving a document. I got the same error (or close to it) when trying to save an attachment to this page (which has a number of attachments, each of which has a number of versions). I've hidden the name of the attachment (sorry - necessary obfuscation). However, it was an excel spreadsheet where the name has spaces in it (if it matters) Platform is JBoss latest being accessed through a mod_jk plug-in on Apache. Any ideas? -Adrian A problem occurred while trying to service your request. Please contact the support if this happens again. Detailed information: Error number 3201 in 3: Exception while saving document PM.Partners.MMR Wrapped Exception: Error number 3234 in 3: Exception while saving attachments attachment list of document PM.Partners.MMR Wrapped Exception: Error number 3232 in 3: Exception while saving attachments for attachment <hidden> of document PM.Partners.MMR Wrapped Exception: a different object with the same identifier value was already associated with the session: [com.xpn.xwiki.doc.XWikiAttachment#-741438755] com.xpn.xwiki.XWikiException: Error number 3201 in 3: Exception while saving document PM.Partners.MMR Wrapped Exception: Error number 3234 in 3: Exception while saving attachments attachment list of document PM.Partners.MMR Wrapped Exception: Error number 3232 in 3: Exception while saving attachments for attachment <hidden> of document PM.Partners.MMR Wrapped Exception: a different object with the same identifier value was already associated with the session: [com.xpn.xwiki.doc.XWikiAttachment#-741438755] at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.jav a:540) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.jav a:557) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:77) at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:560) at com.xpn.xwiki.XWikiService.actionSave(XWikiService.java:445) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:155) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProces sor.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:717) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFi lter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.ja va:81) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalVal ve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssoci ationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java: 59) 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.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:307) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:385) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:748) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:678) at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:871) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) Wrapped Exception: com.xpn.xwiki.XWikiException: Error number 3234 in 3: Exception while saving attachments attachment list of document PM.Partners.MMR Wrapped Exception: Error number 3232 in 3: Exception while saving attachments for attachment <hidden> of document PM.Partners.MMR Wrapped Exception: a different object with the same identifier value was already associated with the session: [com.xpn.xwiki.doc.XWikiAttachment#-741438755] at com.xpn.xwiki.store.XWikiHibernateStore.saveAttachmentList(XWikiHibernateSto re.java:1366) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.jav a:479) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.jav a:557) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:77) at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:560) at com.xpn.xwiki.XWikiService.actionSave(XWikiService.java:445) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:155) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProces sor.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:717) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFi lter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.ja va:81) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalVal ve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssoci ationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java: 59) 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.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:307) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:385) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:748) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:678) at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:871) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) Wrapped Exception: com.xpn.xwiki.XWikiException: Error number 3232 in 3: Exception while saving attachments for attachment <hidden> of document PM.Partners.MMR Wrapped Exception: a different object with the same identifier value was already associated with the session: [com.xpn.xwiki.doc.XWikiAttachment#-741438755] at com.xpn.xwiki.store.XWikiHibernateStore.saveAttachment(XWikiHibernateStore.j ava:1404) at com.xpn.xwiki.store.XWikiHibernateStore.saveAttachmentList(XWikiHibernateSto re.java:1358) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.jav a:479) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.jav a:557) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:77) at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:560) at com.xpn.xwiki.XWikiService.actionSave(XWikiService.java:445) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:155) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProces sor.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:717) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFi lter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.ja va:81) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalVal ve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssoci ationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java: 59) 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.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:307) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:385) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:748) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:678) at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:871) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) Wrapped Exception: org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.xpn.xwiki.doc.XWikiAttachment#-741438755] at org.hibernate.engine.PersistenceContext.checkUniqueness(PersistenceContext.j ava:586) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(Defau ltSaveOrUpdateEventListener.java:254) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(De faultSaveOrUpdateEventListener.java:214) at org.hibernate.event.def.DefaultUpdateEventListener.performSaveOrUpdate(Defau ltUpdateEventListener.java:33) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(Defa ultSaveOrUpdateEventListener.java:69) at org.hibernate.impl.SessionImpl.update(SessionImpl.java:495) at org.hibernate.impl.SessionImpl.update(SessionImpl.java:486) at com.xpn.xwiki.store.XWikiHibernateStore.saveAttachment(XWikiHibernateStore.j ava:1394) at com.xpn.xwiki.store.XWikiHibernateStore.saveAttachmentList(XWikiHibernateSto re.java:1358) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.jav a:479) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.jav a:557) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:77) at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:560) at com.xpn.xwiki.XWikiService.actionSave(XWikiService.java:445) at com.xpn.xwiki.web.ViewEditAction.execute(ViewEditAction.java:155) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProces sor.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:717) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFi lter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.ja va:81) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalVal ve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssoci ationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java: 59) 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.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:307) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:385) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:748) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:678) at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:871) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595)