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From Scott Yeadon <scott.yea...@anu.edu.au>
Subject Pipeline error
Date Fri, 23 Jul 2004 06:16:38 GMT
Hello,

I have the following entry in my sitemap:
<map:match pattern="DC">
    <map:generate type="myGenerator">
    <map:parameter name="parm1" value="value1"/>
    <map:parameter name="parm2" value="value2"/>
    <map:parameter name="parm3" value="value3"/>
    </map:generate>
    <map:transform type="xslt" src="xsl/filter.xsl"/>
    <map:serialize type="xml"/>
</map:match>
(myGenerator is defined in components as <map:generator 
name="myGenerator" src="my.package.myGeneratorClass"/>)

However this always produces a NullPointerException Error.

The generator works fine by itself, the transformer works fine if I 
change the generator's src to come from a file (whose contents is the 
XML created by the generator rather than the java class, but when I run 
them together the error occurs. Thoughts? I have also tried placing the 
generator in an aggregate but (I guess unsurprisingly) makes no difference.

The Exception text is as follows:

org.apache.cocoon.ProcessingException: Failed to execute pipeline.: java.lang.NullPointerException
	at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:552)
	at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(AbstractCachingProcessingPipeline.java:173)
	at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline.java:490)
	at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(SerializeNode.java:120)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:49)
	at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
	at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:126)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
	at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:101)
	at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:336)
	at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:277)
	at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:103)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:49)
	at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
	at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:126)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
	at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:101)
	at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:336)
	at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:277)
	at org.apache.cocoon.Cocoon.process(Cocoon.java:639)
	at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1098)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:354)
	at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:294)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
	at org.mortbay.http.HttpContext.handle(HttpContext.java:1808)
	at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:525)
	at org.mortbay.http.HttpContext.handle(HttpContext.java:1758)
	at org.mortbay.http.HttpServer.service(HttpServer.java:879)
	at org.mortbay.http.HttpConnection.service(HttpConnection.java:790)
	at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:952)
	at org.mortbay.http.HttpConnection.handle(HttpConnection.java:807)
	at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:197)
	at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:289)
	at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:501)
Caused by: java.lang.NullPointerException
	at org.apache.xml.dtm.ref.sax2dtm.SAX2DTM.startElement(SAX2DTM.java:1935)
	at org.apache.xalan.transformer.TransformerHandlerImpl.startElement(TransformerHandlerImpl.java:481)
	at org.apache.cocoon.xml.AbstractXMLPipe.startElement(AbstractXMLPipe.java:95)
	at au.edu.anu.DSpaceDublinCoreGenerator.generate(DSpaceDublinCoreGenerator.java:96)
	at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:545)
	... 36 more
java.lang.NullPointerException
	at org.apache.xml.dtm.ref.sax2dtm.SAX2DTM.startElement(SAX2DTM.java:1935)
	at org.apache.xalan.transformer.TransformerHandlerImpl.startElement(TransformerHandlerImpl.java:481)
	at org.apache.cocoon.xml.AbstractXMLPipe.startElement(AbstractXMLPipe.java:95)
	at au.edu.anu.DSpaceDublinCoreGenerator.generate(DSpaceDublinCoreGenerator.java:96)
	at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:545)
	at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(AbstractCachingProcessingPipeline.java:173)
	at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline.java:490)
	at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(SerializeNode.java:120)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:49)
	at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
	at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:126)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
	at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:101)
	at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:336)
	at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:277)
	at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:103)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:49)
	at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
	at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:126)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
	at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:101)
	at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:336)
	at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:277)
	at org.apache.cocoon.Cocoon.process(Cocoon.java:639)
	at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1098)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:354)
	at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:294)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
	at org.mortbay.http.HttpContext.handle(HttpContext.java:1808)
	at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:525)
	at org.mortbay.http.HttpContext.handle(HttpContext.java:1758)
	at org.mortbay.http.HttpServer.service(HttpServer.java:879)
	at org.mortbay.http.HttpConnection.service(HttpConnection.java:790)
	at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:952)
	at org.mortbay.http.HttpConnection.handle(HttpConnection.java:807)
	at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:197)
	at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:289)
	at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:501)

Thanks.

Scott.

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