[xwiki-users] Sort error in tags

Recently I included the tagcloud snippet in one of my panels. In some pages it works fine, but in other pages I get this error message in stead of the cloud: Error number 4001 in 4: Error while parsing velocity page Main.Tags Wrapped Exception: Invocation of method 'sort' in class com.xpn.xwiki.api.XWiki threw exception java.lang.NullPointerException @ Main.Tags3,25? Error number 4001 in 4: Error while parsing velocity page Main.Tags Wrapped Exception: Invocation of method 'sort' in class com.xpn.xwiki.api.XWiki threw exception java.lang.NullPointerException @ Main.Tags3,25? com.xpn.xwiki.XWikiException: Error number 4001 in 4: Error while parsing velocity page Main.Tags Wrapped Exception: Invocation of method 'sort' in class com.xpn.xwiki.api.XWiki threw exception java.lang.NullPointerException @ Main.Tags3,25? at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:148) at com.xpn.xwiki.render.XWikiVelocityRenderer.render(XWikiVelocityRenderer.java:91) at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:222) at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:154) at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:125) at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:411) at com.xpn.xwiki.objects.classes.TextAreaClass.displayView(TextAreaClass.java:163) at com.xpn.xwiki.doc.XWikiDocument.display(XWikiDocument.java:1312) at com.xpn.xwiki.doc.XWikiDocument.display(XWikiDocument.java:1292) at com.xpn.xwiki.api.Document.display(Document.java:866) at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:240) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:143) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1271) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1240) at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:511) at sun.reflect.GeneratedMethodAccessor135.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:240) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:143) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1271) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1240) at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:511) at sun.reflect.GeneratedMethodAccessor135.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:240) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:143) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1271) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1240) at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:94) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:157) 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: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:117) 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$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) Wrapped Exception: java.lang.NullPointerException at java.util.Collections.sort(Collections.java:116) at com.xpn.xwiki.api.XWiki.sort(XWiki.java:1687) at sun.reflect.GeneratedMethodAccessor179.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203) at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:419) at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:73) at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:125) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:240) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:143) at com.xpn.xwiki.render.XWikiVelocityRenderer.render(XWikiVelocityRenderer.java:91) at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:222) at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:154) at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:125) at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:411) at com.xpn.xwiki.objects.classes.TextAreaClass.displayView(TextAreaClass.java:163) at com.xpn.xwiki.doc.XWikiDocument.display(XWikiDocument.java:1312) at com.xpn.xwiki.doc.XWikiDocument.display(XWikiDocument.java:1292) at com.xpn.xwiki.api.Document.display(Document.java:866) at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:240) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:143) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1271) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1240) at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:511) at sun.reflect.GeneratedMethodAccessor135.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:240) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:143) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1271) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1240) at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:511) at sun.reflect.GeneratedMethodAccessor135.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:240) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:143) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1271) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1240) at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:94) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:157) 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: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:117) 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) Sorry for the long text. When I want to view All Tags from my menu, I get no tags, and the source of the page shows a similar error message. Any help is welcome. Inge De disclaimer van toepassing op e-mail van de gemeente Den Haag vindt u op: http://www.denhaag.nl/disclaimer