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From Scott Yeadon <scott.yea...@anu.edu.au>
Subject Re: Pipeline error
Date Mon, 26 Jul 2004 01:35:05 GMT
Hi Jorg,

Yes you're right, problem turned out I was passing null instead of an 
empty AttributesImpl to the startElement method. Is it a bug that the 
serializer accepts this but the transformer doesn't? - made it appear 
that there was some problem when running the generator and transformer 
together (as they both worked fine separately) so I was looking for 
problems that weren't there, and I assume the xml serializer is also 
processing the same SAX events as the transformer. Either way, my 
mistake, but sorted now, thanks.

Scott.

Jorg Heymans wrote:

> obviously you're not generating the XML like you think you are. 
> Doublecheck for null on creation of all elements, run "cocoon.sh 
> servlet-debug" and attach with your IDE. Should be trivial to find out 
> exactly where it is failing.
>
>
> 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
>
> Scott Yeadon wrote:
>
>> 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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