[xwiki-users] Getting Error number 4001 frequently

I am frequently (and randomly it seems) getting a 4001 error while parsing velocity page /templates/wysiwyginput.vm when loading pages for inline-edits. This is happening both on fields that have wiki-syntax (2.0) content and fields that while able to take wiki-syntax content, have only plain text. (i.e. "Lengthy, detailed information as needed. A good use of this would be training for new application features. This will be limited to text. If more is needed the user should be redirected to more detailed help documentation.") If the inline-edit page is immediately hard-refreshed (<CTRL>+<F5>), the message usually goes away and the correct content is displayed. However, users often don't notice the problem until 3-5 edits later, once the error message output has been saved to the field. (see log messages below) The setup that I have is: -- Page -- 1 Class Object of type A w/ multiple properties (incl. several textarea fields) -- Many Class Objects of type B w/ multiple properties (incl. several textarea fields) -- Many Class Objects of type C w/ multiple properties (incl. several textarea fields) The problem has occurred for objects from all three classes, and there doesn't seem to be any consistency as to which class/property it happens to. The biggest thing that I can't figure out is that for one load of the page it's fine, then it's broken, then (without changing the underlying data or code) it's fine again. Thanks! --Matt Here is the output from the catalina.out log file: 2010-09-09 18:12:59,874 [http://xwiki.internal.nwresearch.com/xwiki/bin/preview/ProjectManagemen t/UseCase%2DAddEditDeleteListSystemUpdateNotifications] ERROR internal.DefaultHTMLConverter - Can't find descriptor for the component [role = [org.xwiki.rendering.renderer.BlockRenderer] hint = [default]] org.xwiki.component.manager.ComponentLookupException: Can't find descriptor for the component [role = [org.xwiki.rendering.renderer.BlockRenderer] hint = [default]] at org.xwiki.component.embed.EmbeddableComponentManager.initialize(Embeddab leComponentManager.java:356) at org.xwiki.component.embed.EmbeddableComponentManager.lookup(EmbeddableCo mponentManager.java:109) at org.xwiki.component.internal.DefaultComponentManager.lookup(DefaultCompo nentManager.java:85) at com.xpn.xwiki.wysiwyg.server.converter.internal.DefaultHTMLConverter.fro mHTML(DefaultHTMLConverter.java:104) at com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion Filter.java:117) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java: 68) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor erFilter.java:304) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi ngFilter.java:112) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2 98) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85 2) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process( Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619) 2010-09-09 18:12:59,890 [http://xwiki.internal.nwresearch.com/xwiki/bin/preview/ProjectManagemen t/UseCase%2DAddEditDeleteListSystemUpdateNotifications] ERROR filter.ConversionFilter - Exception while parsing HTML java.lang.RuntimeException: Exception while parsing HTML at com.xpn.xwiki.wysiwyg.server.converter.internal.DefaultHTMLConverter.fro mHTML(DefaultHTMLConverter.java:110) at com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion Filter.java:117) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java: 68) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor erFilter.java:304) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi ngFilter.java:112) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2 98) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85 2) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process( Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619) Caused by: org.xwiki.component.manager.ComponentLookupException: Can't find descriptor for the component [role = [org.xwiki.rendering.renderer.BlockRenderer] hint = [default]] at org.xwiki.component.embed.EmbeddableComponentManager.initialize(Embeddab leComponentManager.java:356) at org.xwiki.component.embed.EmbeddableComponentManager.lookup(EmbeddableCo mponentManager.java:109) at org.xwiki.component.internal.DefaultComponentManager.lookup(DefaultCompo nentManager.java:85) at com.xpn.xwiki.wysiwyg.server.converter.internal.DefaultHTMLConverter.fro mHTML(DefaultHTMLConverter.java:104) ... 22 more org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content with id [/templates/wysiwyginput.vm] at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:200) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:156) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere r.java:116) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1791) at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:154) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:224) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.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:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:129) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion Filter.java:152) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java: 68) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor erFilter.java:304) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi ngFilter.java:112) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2 98) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85 2) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process( Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619) Caused by: org.apache.velocity.exception.VelocityException: Reference evaluation threw an exception at /templates/wysiwyginput.vm[line 57, column 7] at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen ce.java:481) at org.apache.velocity.runtime.parser.node.ASTAndNode.evaluate(ASTAndNode.j ava:104) at org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpres sion.java:62) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:85) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:87) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:336) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:191) ... 39 more Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at java.util.HashMap$EntryIterator.next(HashMap.java:834) at java.util.HashMap$EntryIterator.next(HashMap.java:832) at java.util.AbstractMap.toString(AbstractMap.java:485) at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen ce.java:477) ... 46 more Here is the output that displays in the field: Error number 4001 in 4: Error while parsing velocity page /templates/wysiwyginput.vm Wrapped Exception: Failed to evaluate content with id [/templates/wysiwyginput.vm] (% id="xwikierror1" style="display: none;" %) ((( (% class="xwikierror" %) {{{Error number 4001 in 4: Error while parsing velocity page /templates/wysiwyginput.vm Wrapped Exception: Failed to evaluate content with id [/templates/wysiwyginput.vm] com.xpn.xwiki.XWikiException: Error number 4001 in 4: Error while parsing velocity page /templates/wysiwyginput.vm Wrapped Exception: Failed to evaluate content with id [/templates/wysiwyginput.vm] at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere r.java:122) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1791) at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:154) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:224) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.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:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:129) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion Filter.java:152) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java: 68) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor erFilter.java:304) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi ngFilter.java:112) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2 98) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85 2) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process( Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619) Wrapped Exception: org.apache.velocity.exception.VelocityException: Reference evaluation threw an exception at /templates/wysiwyginput.vm[line 57, column 7] at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen ce.java:481) at org.apache.velocity.runtime.parser.node.ASTAndNode.evaluate(ASTAndNode.j ava:104) at org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpres sion.java:62) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:85) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:87) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:336) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:191) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:156) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere r.java:116) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1791) at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:154) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:224) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.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:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:129) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion Filter.java:152) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java: 68) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor erFilter.java:304) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi ngFilter.java:112) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2 98) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85 2) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process( Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619) Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at java.util.HashMap$EntryIterator.next(HashMap.java:834) at java.util.HashMap$EntryIterator.next(HashMap.java:832) at java.util.AbstractMap.toString(AbstractMap.java:485) at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen ce.java:477) ... 46 more }}} )))