Can anyone shed light on this ??
Original exception : java.lang.NullPointerException
at org.apache.xml.dtm.ref.sax2dtm.SAX2DTM.comment(SAX2DTM.java:2486)
at org.apache.xalan.transformer.TransformerHandlerImpl.comment(TransformerHandlerImpl.java:933)
at org.apache.cocoon.xml.AbstractXMLPipe.comment(AbstractXMLPipe.java:265)
at org.apache.cocoon.xml.AbstractXMLPipe.comment(AbstractXMLPipe.java:265)
at org.apache.cocoon.components.profiler.ProfilingSAXConnector.comment(ProfilingSAXConnector.java:226)
at org.apache.cocoon.xml.ContentHandlerWrapper.comment(ContentHandlerWrapper.java:304)
at org.apache.xerces.parsers.AbstractSAXParser.comment(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanComment(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
Jorg Heymans wrote:
I just got a NPE at another place :
org.apache.cocoon.ProcessingException: Exception during processing of file:/opt/jakarta-tomcat-5.0.19/webapps/cocoon/app/gfx/sitemap.xmap: java.lang.NullPointerException
at org.apache.cocoon.components.source.AbstractStreamSource.toSAX(AbstractStreamSource.java:205)
at
Looking at this method
public void toSAX(ContentHandler handler) throws SAXException, ProcessingException {
SAXParser parser = null; try { parser = (SAXParser)this.manager.lookup(SAXParser.ROLE);
Under which circumstances can the lookup *sometimes* return null here? This is my xml parser config
<xml-parser class="org.apache.excalibur.xml.impl.JaxpParser" logger="core.xml-parser" pool-grow="4" pool-max="32" pool-minj="8">
<parameter name="validate" value="false"/>
<parameter name="namespace-prefixes" value="false"/>
<parameter name="stop-on-warning" value="true"/>
<parameter name="stop-on-recoverable-error" value="true"/>
<parameter name="reuse-parsers" value="true"/>
</xml-parser>
If it's a pool issue why is my jmeter script not getting similar errors returned?
Thoughts? Jorg
Jorg Heymans wrote:
Hi,
I have a jmeter script with 3 threads firing off requests to cocoon.
After a while, when I try to access the cocoon instance through my browser and loading the simplest of pages (read file, xslt, serialize html) i get a nullpointerexception during XSLT transformation. The funny thing is that this only happens *sometimes*. The only constant thing is that when a request fails it always fails during the xslt transformation with a nullpointerexception.
I first thought that this was due to undersized pools, but i've set a pool-size of 200 with pool-min 20 and pool-grow 10 on all sitemap components and it still happens. The pool seems to be managing component instances correctly because from debugging statements, the number of components received from and returned to the pool are identical.
Thoughts?
Example stacktrace:
org.apache.cocoon.ProcessingException: Exception during processing of file:/opt/jakarta-tomcat-5.0.19/webapps/cocoon/app/common/stylesheets/remove_namespaces.xsl: java.lang.NullPointerException
at org.apache.cocoon.components.source.AbstractStreamSource.toSAX(AbstractStreamSource.java:205)
at org.apache.cocoon.components.xslt.XSLTProcessorImpl.getTransformerHandler(XSLTProcessorImpl.java:275)
at org.apache.cocoon.components.xslt.XSLTProcessorImpl.getTransformerHandler(XSLTProcessorImpl.java:240)
at org.apache.cocoon.transformation.TraxTransformer.setup(TraxTransformer.java:313)
at org.apache.cocoon.components.pipeline.AbstractEventPipeline.setupPipeline(AbstractEventPipeline.java:204)
at org.apache.cocoon.components.pipeline.CachingEventPipeline.setup(CachingEventPipeline.java:290)
at org.apache.cocoon.components.pipeline.CachingEventPipeline.process(CachingEventPipeline.java:180)
at org.apache.cocoon.components.profiler.ProfilingCachingEventPipeline.process(ProfilingCachingEventPipeline.java:122)
at org.apache.cocoon.components.pipeline.CachingStreamPipeline.process(CachingStreamPipeline.java:412)
at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(SerializeNode.java:148)
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