Hi Ludovic, First of all thank you for your response. I have tried by removing the Calendar Plugin but still getting the similar error. 10:17:01,204 WARN [ACTIVE] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)' http://3.170.64.77:7001/xwiki/bin/view/Main/WebHome JDBCExceptionReporter:logExceptions:71 - SQL Error: 1400, SQLState: 23000 10:17:01,211 ERROR [ACTIVE] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)' http://3.170.64.77:7001/xwiki/bin/view/Main/WebHome JDBCExceptionReporter:logExceptions:72 - ORA-01400: cannot insert NULL into ("XWIKI"."XWIKIDOC"."XWD_TITLE") 10:17:01,216 WARN [ACTIVE] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)' http://3.170.64.77:7001/xwiki/bin/view/Main/WebHome JDBCExceptionReporter:logExceptions:71 - SQL Error: 1400, SQLState: 23000 10:17:01,221 ERROR [ACTIVE] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)' http://3.170.64.77:7001/xwiki/bin/view/Main/WebHome JDBCExceptionReporter:logExceptions:72 - ORA-01400: cannot insert NULL into ("XWIKI"."XWIKIDOC"."XWD_TITLE") 10:17:01,228 ERROR [ACTIVE] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)' http://3.170.64.77:7001/xwiki/bin/view/Main/WebHome AbstractFlushingEventListener:performExecutions:299 - Could not synchronize database state with session org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:69) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:202) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:230) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:296) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1009) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:356) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106) at com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:573) at com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:547) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:309) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:100) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:94) at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:891) at com.xpn.xwiki.XWiki.getPrefsClass(XWiki.java:2292) at com.xpn.xwiki.XWiki.initXWiki(XWiki.java:674) at com.xpn.xwiki.XWiki.<init>(XWiki.java:566) at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:281) at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:382) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:96) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:743) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:121) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3243) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2003) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1909) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1359) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209) at weblogic.work.ExecuteThread.run(ExecuteThread.java:181) Caused by: java.sql.BatchUpdateException: ORA-01400: cannot insert NULL into ("XWIKI"."XWIKIDOC"."XWD_TITLE") at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:343) at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10698) at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:294) at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:294) at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:58) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195) ... 40 more com.xpn.xwiki.XWikiException: Error number 3201 in 3: Exception while saving document XWiki.XWikiPreferences Wrapped Exception: Could not execute JDBC batch update at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:314) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:100) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:94) at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:891) at com.xpn.xwiki.XWiki.getPrefsClass(XWiki.java:2292) at com.xpn.xwiki.XWiki.initXWiki(XWiki.java:674) at com.xpn.xwiki.XWiki.<init>(XWiki.java:566) at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:281) at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:382) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:96) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:743) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:121) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3243) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2003) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1909) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1359) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209) at weblogic.work.ExecuteThread.run(ExecuteThread.java:181) Wrapped Exception: java.sql.BatchUpdateException: ORA-01400: cannot insert NULL into ("XWIKI"."XWIKIDOC"."XWD_TITLE") at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:343) at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10698) at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:294) at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:294) at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:58) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:230) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:296) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1009) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:356) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106) at com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:573) at com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:547) at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:309) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:100) at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:94) at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:891) at com.xpn.xwiki.XWiki.getPrefsClass(XWiki.java:2292) at com.xpn.xwiki.XWiki.initXWiki(XWiki.java:674) at com.xpn.xwiki.XWiki.<init>(XWiki.java:566) at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:281) at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:382) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:96) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:743) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:121) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3243) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2003) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1909) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1359) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209) at weblogic.work.ExecuteThread.run(ExecuteThread.java:181) 10:17:01,271 WARN [ACTIVE] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)' RequestProcessor:processException:528 - Unhandled Exception thrown: class com.xpn.xwiki.XWikiException <Mar 13, 2007 10:17:01 AM EDT> <Error> <HTTP> <BEA-101017> <[weblogic.servlet.internal.WebAppServletContext@e5376a - appName: '_appsdir_xwiki_dir', name: 'xwiki', context-path: '/xwiki'] Root cause of ServletException. com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize main XWiki context Wrapped Exception: Error number 3201 in 3: Exception while saving document XWiki.XWikiPreferences Wrapped Exception: Could not execute JDBC batch update at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:290) at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:382) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:96) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) Truncated. see log file for complete stacktrace