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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