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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