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From "Robin Green" <gree...@hotmail.com>
Subject Re: Cocoon 1.8, NullPointerException, and Xerces...
Date Wed, 27 Sep 2000 21:44:55 GMT
"Alcoff, Samuel" <salcoff@blackrock.com> wrote:
>	I'm having a bit of a problem with a freshly installed Cocoon 1.8.

[NOTE: this means Xerces 1.2 is installed]

>	It seems I'm getting a NullPointerException from the depths of
>Xerces in certain cases during an XML->XSL translation.  See stack trace #1
>below.

Looks like a Xerces bug. For a quick workaround, try downgrading Xerces.

>
>	What's odd is I don't get an error the first time I load a
>particular XML document.  I'll load a document (about 50-60K xml), it will
>render fine, then attempt to load another similar XML document, using the
>same XSL (again about 50-60K), and I'll get this error.  From then on, any
>XML->XSL translation fails, even the samples (which work fine when I 
>freshly
>restart tomcat).
>
>	My thought is that this may have something to do with caching...
>When I disable cocoon caching, I generate a NullPointerException the very
>first time a page is translated - in the same method/different file, but
>with a different stack trace.  See Stack Trace #2 below.  I only get this
>stack trace once, any further XML->XSL transformations result in Stack 
>Trace
>#1.
>
>	I'm pretty sure my classpath is set correctly (it's below as well),
>and that the document's I'm translating are valid.  Even if it is an issue
>with the documents (which it may be) why would they translate properly 
>once,
>then cause all other documents to fail?  Also, a malformed document
>shouldn't prevent the rest of the system from functioning properly (at 
>least
>not when it's just straight XML->XSL).
>
>	So, before I start diving into the depths of tomcat/cocoon/xerces,
>does anyone have a hint as to what's up?  Any help appreciated...
>
>			Thanks,
>			  Sam
>
>** Stack Trace #1:
>java.lang.NullPointerException
>                    at
>org.apache.xerces.dom.DeferredDocumentImpl.synchronizeChildren(DeferredDocum
>entImpl.java:1402)
>                    at
>org.apache.xerces.dom.ParentNode.getChildNodes(ParentNode.java:237)
>                    at org.apache.cocoon.Utils.getFirstPI(Utils.java:116)
>                    at
>org.apache.cocoon.processor.ProcessorFactory.getType(ProcessorFactory.java:7
>9)
>                    at
>org.apache.cocoon.processor.ProcessorFactory.getProcessor(ProcessorFactory.j
>ava:70)
>                    at org.apache.cocoon.Engine.handle(Engine.java:355)
>                    at org.apache.cocoon.Cocoon.service(Cocoon.java:167)
>                    at
>javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
>                    at
>org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
>                    at
>org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
>                    at
>org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
>onnectionHan      at java.lang.Thread.run(Thread.java:479)
>
>** Stack Trace #2:
>           java.lang.NullPointerException
>                    at
>org.apache.xerces.dom.ChildAndParentNode.synchronizeChildren(ChildAndParentN
>ode.java:909)
>                    at
>org.apache.xerces.dom.DeferredElementNSImpl.synchronizeChildren(DeferredElem
>entNSImpl.java:174)
>                    at
>org.apache.xerces.dom.ChildAndParentNode.getFirstChild(ChildAndParentNode.ja
>va:237)
>                    at
>org.apache.xalan.xpath.xml.XMLParserLiaisonDefault.getNodeData(XMLParserLiai
>sonDefault.java:1502)
>                    at
>org.apache.xalan.xpath.xml.XMLParserLiaisonDefault.getNodeData(XMLParserLiai
>sonDefault.java:1474)
>                    at
>org.apache.xalan.xpath.XNodeSet.getStringFromNode(XNodeSet.java:151)
>                    at 
>org.apache.xalan.xpath.XNodeSet.str(XNodeSet.java:170)
>                    at
>org.apache.xalan.xslt.ElemValueOf.execute(ElemValueOf.java:203)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
>t.java:661)
>                    at
>org.apache.xalan.xslt.ElemLiteralResult.execute(ElemLiteralResult.java:254)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
>t.java:.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateEl
>ement.java:661)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.transformChild(ElemTemplateElement
>.java:1199)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.processLocatedNode(ElemTemplateEle
>ment.java:1061)
>                    at
>org.apache.xalan.xpath.SimpleNodeLocator.findSelf(SimpleNodeLocator.java:613
>)
>                    at
>org.apache.xalan.xpath.SimpleNodeLocator.step(SimpleNodeLocator.java:406)
>                    at
>org.apache.xalan.xpath.SimpleNodeLocator.locationPath(SimpleNodeLocator.java
>:321)
>                    at
>org.apache.xalan.xpath.XPath.locationPath(XPath.java:964)
>                    at 
>org.apache.xalan.xpath.XPath.execute(XPath.java:1385)
>                    at 
>org.apache.xalan.xpath.XPath.execute(XPath.java:1354)
>                    at org.apache.xalan.xpath.XPath.exect.java:896)
>                    at
>org.apache.xalan.xslt.ElemApplyTemplates.execute(ElemApplyTemplates.java:176
>)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
>t.java:661)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.transformChild(ElemTemplateElement
>.java:1199)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.transformSelectedChildren(ElemTemp
>lateElement.java:962)
>                    at
>org.apache.xalan.xslt.ElemForEach.execute(ElemForEach.java:127)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
>t.java:661)
>                    at
>org.apache.xalan.xslt.ElemLiteralResult.execute(ElemLiteralResult.java:254)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
>t.java:661)
>                    at
>org.apache.xalan.xslt.ElemLiteralResult.execute(ElemLiteralResult.java:254)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
>t.java:661)
>                    at
>org.apache.xalan.xslt.ElemLiteralResult.execute(ElemLiteralResult.java:254)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
>t.java:661)
>                    at
>org.apache.xalan.xslt.ElemLiteralResult.execute(ElemLiteralResult.java:254)
>                    at
>org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
>t.java:661)
>                    at
>org.apache.xalan.xslt.ElemTemplate.execute(ElemTemplate.java:145)
>                    at
>org.apache.xalan.xslt.StylesheetRoot.process(StylesheetRoot.java:443)
>                    at
>org.apache.xalan.xslt.XSLTEngineImpl.process(XSLTEngineImpl.java:647)
>                    at
>org.apache.cocoon.transformer.XalanTransformer.transform(XalanTransformer.ja
>va:101)
>                    at
>org.apache.cocoon.processor.xslt.XSLTProcessor.process(XSLTProcessor.java:11
>0)
>                    at org.apache.cocoon.Engine.handle(Engine.java:359)
>                   ava:865)
>                    at
>org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
>                    at
>org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
>                    at
>org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
>onnectionHandler.java:160)
>                    at
>org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338
>)
>                    at java.lang.Thread.run(Thread.java:479)
>
>** System Details and classpath:
>	This is running on Solaris 2.6, JVM 1.2.2, Tomcat 3.1.
>
>	Here's the classpath:
>classPath="/opt/httpd/servlet/bin/../lib/ant.jar:/opt/httpd/servlet/bin/../l
>ib/bsf.jar:/opt/httpd/servlet/bin/../lib/bsfengines.jar:/opt/httpd/servlet/b
>in/../lib/cocoon.jar:/opt/httpd/servlet/bin/../lib/fop_0_13_0.jar:/opt/httpd
>/servlet/bin/../lib/jasper.jar:/opt/httpd/servlet/bin/../lib/servlet_2_2.jar
>:/opt/httpd/servlet/bin/../lib/test:/opt/httpd/servlet/bin/../lib/turbine-po
>ol.jar:/opt/httpd/servlet/bin/../lib/webserver.jar:/opt/httpd/servlet/bin/..
>/lib/xalan_1_2_D02.jar:/opt/httpd/servlet/bin/../lib/xerces_1_2.jar:/opt/htt
>pd/servlet/bin/../lib/xml.jar:/usr/local/java/jdk1.2.2/lib/tools.jar:/u1/sal
>coff/dev.sol/lib/java/1.2:/u1/build/dev/lib/java/1.2:/usr/local/java/ext1.2:
>/usr/local/java/xalan_1_1/bsf.jar:/usr/local/java/xalan_1_1/bsfengines.jar:/
>opt/httpd/servlet/lib/fop_0_12_1.jar:/opt/httpd/servlet/lib/cocoon.jar:/usr/
>local/bfm/lib/java/1.2"
>
>
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