[COCOON-1492] NPE by adding an extra HTML tag in hello.xml

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.1.7
• Component/s: * Cocoon Core
• Environment: Operating System: All; Platform: All
• Bugzilla Id: 34386
• Assignee: Unassigned
• Reporter: Sakai, Kazuhiro
• Created: 10/Apr/05 04:01
• Updated: 16/Feb/11 13:55

Description

I downloaded 2.1.7, built it, and started with the cocoon.sh. Most of the samples seem working just
fine, and they are very nice.

However, there is a very simple problem with the Hello World sample. I added an extra html tag, such
as <b>, in the hello.xml file, then the HTML generation from the XML file started failing and saying
NullPointerException. It does not happen when generating XHTML or CHTML from the same XML file.

I could reproduce this on the following platforms:
HPUX w/ Java 1.3.1.11
Mac OS X (Panther) w/ Java 1.4.2

Modified hello.xml:
<page>
 <title>Hello</title>
 <content>
  <para>This is my <b>first</b> Cocoon page!</para>
 </content>
</page>


Stacktrace:
org.apache.cocoon.ProcessingException: Error executing pipeline.: java.lang.RuntimeException:
java.lang.NullPointerException
        at
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.handleException(AbstractProcessin
gPipeline.java:940)
        at
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(A
bstractCachingProcessingPipeline.java:281)
        at
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline
.java:483)
        at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(SerializeNode.java:
120)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:46)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchN
ode.java:130)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:
138)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:234)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:176)
        at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)
        at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:46)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchN
ode.java:130)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:
138)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:234)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:176)
        at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)
        at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:46)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchN
ode.java:130)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:
138)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:234)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:176)
        at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)
        at org.apache.cocoon.Cocoon.process(Cocoon.java:608)
        at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1123)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:358)
        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:1807)
        at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:525)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1757)
        at org.mortbay.http.HttpServer.service(HttpServer.java:879)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:789)
        at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:960)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:806)
        at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:218)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:300)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:511)
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
        at org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3418)
        at
org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:
389)
        at org.apache.cocoon.xml.AbstractXMLPipe.endDocument(AbstractXMLPipe.java:55)
        at org.apache.cocoon.transformation.TraxTransformer.endDocument(TraxTransformer.java:560)
        at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown Source)
        at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
        at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
        at org.apache.xerces.impl.XMLEntityScanner.skipSpaces(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentScannerImpl$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:275)
        at org.apache.cocoon.generation.FileGenerator.generate(FileGenerator.java:115)
        at
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(A
bstractCachingProcessingPipeline.java:269)
        ... 47 more
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:55)
        at org.apache.cocoon.transformation.TraxTransformer.endDocument(TraxTransformer.java:560)
        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:275)
        at org.apache.cocoon.generation.FileGenerator.generate(FileGenerator.java:115)
        at
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(A
bstractCachingProcessingPipeline.java:269)
        at
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline
.java:483)
        at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(SerializeNode.java:
120)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:46)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchN
ode.java:130)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:
138)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:234)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:176)
        at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)
        at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:46)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchN
ode.java:130)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:
138)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:234)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:176)
        at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)
        at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:46)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchN
ode.java:130)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:
138)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractPar
entProcessingNode.java:68)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:234)
        at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.j
ava:176)
        at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)
        at org.apache.cocoon.Cocoon.process(Cocoon.java:608)
        at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1123)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:358)
        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:1807)
        at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:525)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1757)
        at org.mortbay.http.HttpServer.service(HttpServer.java:879)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:789)
        at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:960)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:806)
        at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:218)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:300)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:511)