Hi,
We are using
Oracle's new-ish (since 9i I think) XML DB feature called "DBUri" to
directly retrieve an XML representation of our data via HTTP URLs, for use
in our Cocoon pipelines. DBUri provides a servlet located on the database
machine (which is also running a servlet engine, part of the standard
installation procedure) that is able to take a combination of table
references and XPath to query the database and return the result as
XML. Among other things, a big plus is we can avoid having to use SQL in
XSPs.
Unfortunately, when I try to use this DBUri XML as the
generator for a pipeline that outputs HTML, I get a NullPointerException
somewhere deep within Xalan's TransformerImpl class, when handling an
"endDocument" event from the looks of things. If you have any suggestions for
fixing this it would be much appreciated!
Original Exception: java.lang.RuntimeException:
java.lang.RuntimeException: java.lang.NullPointerException
at
org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3418)
at
org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:389)
at
org.apache.cocoon.xml.AbstractXMLPipe.endDocument(AbstractXMLPipe.java:56)
...
(Full stack
trace at end of this email...)
For more
info on Oracle DBUri, go to http://download-west.oracle.com/docs/cd/B14117_01/appdev.101/b10790/xdb15dbu.htm - you may need a technet login. We
are using Cocoon 2.1.5,
Tomcat 5.0.19, Oracle 10g and Redhat Linux (on Intel)
The
simplified pipeline looks like this:
<map:match
pattern="test">
<map:generate src=""http://scott:[EMAIL PROTECTED]:8080/oradb/RELATIONSHIP_XML/ROW[ROOT_TITLE='index_skin']/XML_RELATIONSHIP?contenttype=text/xml">http://scott:[EMAIL PROTECTED]:8080/oradb/RELATIONSHIP_XML/ROW[ROOT_TITLE='index_skin']/XML_RELATIONSHIP" />
<map:transform type="cinclude" />
<map:transform src="" />
<map:serialize type="html" />
</map:match>
<map:generate src=""http://scott:[EMAIL PROTECTED]:8080/oradb/RELATIONSHIP_XML/ROW[ROOT_TITLE='index_skin']/XML_RELATIONSHIP?contenttype=text/xml">http://scott:[EMAIL PROTECTED]:8080/oradb/RELATIONSHIP_XML/ROW[ROOT_TITLE='index_skin']/XML_RELATIONSHIP" />
<map:transform type="cinclude" />
<map:transform src="" />
<map:serialize type="html" />
</map:match>
In
short this pipeline:
1. Retrieves
the disk location of an HTML file from the Oracle db using DBUri, looking up by
name 'index_skin'
2. Uses the
include transformer to load the actual HTML file from disk using the path
returned from the db
3. Convert
the stream into proper HTML, stripping out extraneous XML,
etc
4. Serialise
as HTML
It may be useful to know that I can get this pipeline to work
by altering _any one_ of the following aspects of the
pipeline:
- Serialise as XHTML rather than HTML (this uses the
XMLSerializer)
- Replace the Oracle DBUri generator with a
basic http call to a static XML file (with the exact same content) stored
on a web server on a different machine.
- Load the DBUri XML from within a document() call
inside an XSLT stylesheet, rather than loading it in a
generator
This indicates to me that the problem area lies in the
combination of using the XML returned by Oracle's DBUri as the generator and the
HTMLSerializer.
Here is the
full stack trace:
Original
Exception: java.lang.RuntimeException: java.lang.RuntimeException:
java.lang.NullPointerException
at org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3418)
at org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:389)
at org.apache.cocoon.xml.AbstractXMLPipe.endDocument(AbstractXMLPipe.java:56)
at org.apache.cocoon.transformation.TraxTransformer.endDocument(TraxTransformer.java:549)
at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.skipSpaces(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.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.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.excalibur.xml.impl.JaxpParser.parse(JaxpParser.java:296)
at org.apache.excalibur.xml.impl.JaxpParser.parse(JaxpParser.java:315)
at org.apache.cocoon.components.source.SourceUtil.parse(SourceUtil.java:252)
at org.apache.cocoon.generation.FileGenerator.generate(FileGenerator.java:116)
at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:545)
at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(AbstractCachingProcessingPipeline.java:166)
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.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:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
at java.lang.Thread.run(Thread.java:534)
at org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3418)
at org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:389)
at org.apache.cocoon.xml.AbstractXMLPipe.endDocument(AbstractXMLPipe.java:56)
at org.apache.cocoon.transformation.TraxTransformer.endDocument(TraxTransformer.java:549)
at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.skipSpaces(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.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.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.excalibur.xml.impl.JaxpParser.parse(JaxpParser.java:296)
at org.apache.excalibur.xml.impl.JaxpParser.parse(JaxpParser.java:315)
at org.apache.cocoon.components.source.SourceUtil.parse(SourceUtil.java:252)
at org.apache.cocoon.generation.FileGenerator.generate(FileGenerator.java:116)
at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:545)
at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(AbstractCachingProcessingPipeline.java:166)
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.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:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
at java.lang.Thread.run(Thread.java:534)
Thanks for reading,
Oliver
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