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Posted to xindice-users@xml.apache.org by Julie McCabe <ju...@qub.ac.uk> on 2003/10/24 16:23:11 UTC
nullpointer exception
Hello
Does anyone know what this exeception means? I am running a mulit-threaded
java program which accesses a number of xindice collections - any ideas would
be useful as I have no ideas as there is no reference to my code in the stack
trace.
Thanks
Julie
[10/24/2003 15:06:19:009 ] org.apache.xindice.xml [<init>:101] DEBUG: No
message
java.lang.NullPointerException
at
org.apache.xindice.xml.dom.ElementImpl.loadAttributes(ElementImpl.java:185)
at org.apache.xindice.xml.dom.ElementImpl.<init>(ElementImpl.java:97)
at
org.apache.xindice.xml.dom.ContainerNodeImpl.loadChildren(ContainerNodeImpl.java:164)
at
org.apache.xindice.xml.dom.ElementImpl.checkLoaded(ElementImpl.java:145)
at org.apache.xindice.xml.dom.NodeImpl.getPrefix(NodeImpl.java:707)
at
org.apache.xindice.xml.dom.NodeImpl.getNamespaceURI(NodeImpl.java:671)
at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.addNode(DOM2DTM.java:262)
at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.nextNode(DOM2DTM.java:523)
at
org.apache.xml.dtm.ref.DTMDefaultBase._nextsib(DTMDefaultBase.java:554)
at
org.apache.xml.dtm.ref.DTMDefaultBaseTraversers$ChildTraverser.next(DTMDefaultBaseTraversers.java:466)
at org.apache.xpath.axes.AxesWalker.getNextNode(AxesWalker.java:355)
at
org.apache.xpath.axes.WalkingIteratorSorted.setRoot(WalkingIteratorSorted.java:204)
at
org.apache.xpath.axes.LocPathIterator.execute(LocPathIterator.java:242)
at org.apache.xpath.XPath.execute(XPath.java:318)
at org.apache.xpath.XPath.execute(XPath.java:284)
at
org.apache.xindice.core.xupdate.XPathQueryImpl.execute(XPathQueryImpl.java:155)
at
org.xmldb.xupdate.lexus.commands.CommandObject.selectNodes(CommandObject.java:135)
at
org.xmldb.xupdate.lexus.commands.UpdateCommand.execute(UpdateCommand.java:104)
at
org.apache.xindice.core.xupdate.XUpdateImpl.execute(XUpdateImpl.java:156)
at
org.apache.xindice.core.xupdate.XUpdateQueryResolver$XUpdateQuery.execute(XUpdateQueryResolver.java:180)
at
org.apache.xindice.core.xupdate.XUpdateQueryResolver.query(XUpdateQueryResolver.java:120)
at
org.apache.xindice.core.query.QueryEngine.query(QueryEngine.java:163)
at
org.apache.xindice.core.Collection.queryDocument(Collection.java:948)
at
org.apache.xindice.server.rpc.messages.Query.execute(Query.java:100)
at
org.apache.xindice.server.rpc.RPCMessageInterface.run(RPCMessageInterface.java:77)
at sun.reflect.GeneratedMethodAccessor265.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.xmlrpc.Invoker.execute(XmlRpcServer.java)
at
org.apache.xmlrpc.XmlRpcServer$Worker.executeInternal(XmlRpcServer.java)
at org.apache.xmlrpc.XmlRpcServer$Worker.execute(XmlRpcServer.java)
at org.apache.xmlrpc.XmlRpcServer.execute(XmlRpcServer.java)
at org.apache.xmlrpc.XmlRpcServer.execute(XmlRpcServer.java)
at
org.apache.xindice.server.XindiceServlet.doPost(XindiceServlet.java:392)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.globus.tomcat.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:136)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:536)
[10/24/2003 15:06:19:065 ] org.apache.xindice.xml [checkLoaded:150] DEBUG: No
message
java.lang.NullPointerException
at
org.apache.xindice.xml.dom.ElementImpl.checkLoaded(ElementImpl.java:142)
at org.apache.xindice.xml.dom.NodeImpl.getPrefix(NodeImpl.java:707)
at
org.apache.xindice.xml.dom.NodeImpl.getNamespaceURI(NodeImpl.java:671)
at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.addNode(DOM2DTM.java:262)
at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.nextNode(DOM2DTM.java:523)
at
org.apache.xml.dtm.ref.DTMDefaultBase._nextsib(DTMDefaultBase.java:554)
at
org.apache.xml.dtm.ref.DTMDefaultBaseTraversers$ChildTraverser.next(DTMDefaultBaseTraversers.java:466)
at org.apache.xpath.axes.AxesWalker.getNextNode(AxesWalker.java:355)
at
org.apache.xpath.axes.WalkingIteratorSorted.setRoot(WalkingIteratorSorted.java:204)
at
org.apache.xpath.axes.LocPathIterator.execute(LocPathIterator.java:242)
at org.apache.xpath.XPath.execute(XPath.java:318)
at org.apache.xpath.XPath.execute(XPath.java:284)
at
org.apache.xindice.core.xupdate.XPathQueryImpl.execute(XPathQueryImpl.java:155)
at
org.xmldb.xupdate.lexus.commands.CommandObject.selectNodes(CommandObject.java:135)
at
org.xmldb.xupdate.lexus.commands.UpdateCommand.execute(UpdateCommand.java:104)
at
org.apache.xindice.core.xupdate.XUpdateImpl.execute(XUpdateImpl.java:156)
at
org.apache.xindice.core.xupdate.XUpdateQueryResolver$XUpdateQuery.execute(XUpdateQueryResolver.java:180)
at
org.apache.xindice.core.xupdate.XUpdateQueryResolver.query(XUpdateQueryResolver.java:120)
at
org.apache.xindice.core.query.QueryEngine.query(QueryEngine.java:163)
at
org.apache.xindice.core.Collection.queryDocument(Collection.java:948)
at
org.apache.xindice.server.rpc.messages.Query.execute(Query.java:100)
at
org.apache.xindice.server.rpc.RPCMessageInterface.run(RPCMessageInterface.java:77)
at sun.reflect.GeneratedMethodAccessor265.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.xmlrpc.Invoker.execute(XmlRpcServer.java)
at
org.apache.xmlrpc.XmlRpcServer$Worker.executeInternal(XmlRpcServer.java)
at org.apache.xmlrpc.XmlRpcServer$Worker.execute(XmlRpcServer.java)
at org.apache.xmlrpc.XmlRpcServer.execute(XmlRpcServer.java)
at org.apache.xmlrpc.XmlRpcServer.execute(XmlRpcServer.java)
at
org.apache.xindice.server.XindiceServlet.doPost(XindiceServlet.java:392)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.globus.tomcat.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:136)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:536)
--
___________________________________________________________
Julie McCabe email: julie.mccabe@qub.ac.uk
Belfast eScience Centre phone: +44 28 90 27 47 67
Queens University Belfast http://www.qub.ac.uk/escience/
___________________________________________________________