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From "Nicola Ken Barozzi" <nicola...@supereva.it>
Subject Re: Namespace problem in C2 Transformer
Date Wed, 06 Sep 2000 07:30:34 GMT

----- Original Message ----- 
From: "Stefano Mazzocchi" <stefano@apache.org>
To: <cocoon-dev@xml.apache.org>
Sent: Monday, September 04, 2000 7:30 PM
Subject: Re: Namespace problem in C2 Transformer


> Nicola Ken Barozzi wrote:
> > 
> > I'm making a C2 Transformer and I have problems with namespaces.
> > This is my xml:
> > 
> > <?xml version="1.0"?>
> > <contain>
> > <chartdef xmlns="http://apache.org/cocoon/Chart2Svg">
> > <appearance>
> >       <title>IT WORKS!!! :)</title>
> >       <LF3d/>
> >       <colors>
> >          <color>#ffffff</color>
> >          <color>#666666</color>
> >       </colors>
> >    </appearance>
> >   <properties>
> >       <min>0</min>
> >       <max>10</max>
> >    </properties>
> >    <data>
> >       <result xmlns="http://apache.org/cocoon/data">
> >          <row>
> >             <name>1</name>
> >             <surname>4</surname>
> >          </row>
> >          <row>
> >             <name>5</name>
> >             <surname>4</surname>
> >          </row>
> >          <row>
> >             <name>3</name>
> >             <surname>7</surname>
> >         </row>
> >      </result>
> >    </data>
> >  </chartdef>
> > </contain>
> > 
> > Basically I want to read the <result xmlns="http://apache.org/cocoon/data">
> > elements (I just say the transformer to ignore elements out of my <data> element)
> > in my transformer.
> > The two tags with the namespace declarations:
> > 
> > <chartdef xmlns="http://apache.org/cocoon/Chart2Svg">
> > <result xmlns="http://apache.org/cocoon/data">
> > 
> > are giving me a headache.
> > If I capture their startElement and endElement events and don't call anything in
> > them, they disappear in the output but at the and of the _correct_ output I
> > get the following exception:
> > 
> > **********************************************************
> > 
> >  ?????? ?????? ?????? ?????? ?????? ??????
> >  ?      ?   .? ?      ?   .? ?.   ? ?    ?
> >  ?????? ?????? ?????? ?????? ?????? ?    ? @version@
> > 
> > --- Error in the Cocoon 2 pipeline >X==< ---
> > 
> >  error - Exception in transformer chart2svg with uri http://apache.org/cocoon/Chart2Svg
while ending element.
> > 
> >  description - java.lang.NullPointerException
> > 
> >  from - org.apache.cocoon.generation.ErrorGenerator
> > 
> >  source - org.xml.sax.SAXException
> > 
> >  stacktrace - java.lang.NullPointerException
> >         at org.apache.cocoon.transformation.EventBasedAbstractTransformer.endElement(EventBasedAbstractTransformer.java
> > , Compiled Code)
> >         at org.apache.xerces.parsers.SAXParser.endElement(SAXParser.java, Compiled
Code)
> >         at org.apache.xerces.validators.common.XMLValidator.callEndElement(XMLValidator.java,
Compiled Code)
> >         at org.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.dispatch(XMLDocumentScanner.java,
Compiled
> > Code)
> >         at org.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentScanner.java,
Compiled Code)
> >         at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:861)
> >         at org.apache.cocoon.components.parser.XercesParser.parse(XercesParser.java:40)
> >         at org.apache.cocoon.generation.FileGenerator.generate(FileGenerator.java:31)
> >         at org.apache.cocoon.sitemap.ResourcePipeline.process(ResourcePipeline.java,
Compiled Code)
> >         at _C_._jakarta_tomcat._webapps._cocoon._sitemap_xmap.process(_sitemap_xmap.java:1415)
> >         at org.apache.cocoon.sitemap.SitemapHandler.process(SitemapHandler.java:127)
> >         at org.apache.cocoon.sitemap.SitemapManager.invoke(SitemapManager.java:83)
> >         at org.apache.cocoon.Cocoon.process(Cocoon.java:206)
> >         at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:191)
> >         at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
> >         at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java,
Compiled Code)
> >         at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
> >         at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
> >         at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
> >         at java.lang.Thread.run(Thread.java:479)
> > 
> > **************** printStream notifications: 1 ***************
> > 
> > The exception disappears only if I call super on both events (two start, two end).
> > It also disappears if I only take away xmlns="http://apache.org/cocoon/data" .
> > 
> > I get the same error with:
> > 
> > <contain>
> > <chart:chartdef xmlns:chart="http://apache.org/cocoon/Chart2Svg">
> > <chart:appearance>
> >       <chart:title>IT WORKS!!! :)</chart:title>
> >       <chart:LF3d/>
> >       <chart:colors>
> >          <chart:color>#ffffff</chart:color>
> >          <chart:color>#666666</chart:color>
> >       </chart:colors>
> >    </chart:appearance>
> >   <chart:properties>
> >       <chart:min>0</chart:min>
> >       <chart:max>10</chart:max>
> >    </chart:properties>
> >    <chart:data>
> >       <result>
> >          <row>
> >             <name>1</name>
> >             <surname>4</surname>
> >          </row>
> >          <row>
> >             <name>5</name>
> >             <surname>4</surname>
> >          </row>
> >          <row>
> >             <name>3</name>
> >             <surname>7</surname>
> >         </row>
> >       </result>
> >    </chart:data>
> >   </chart:chartdef>
> > </contain>
> > 
> > but it stops calling after </chart:chartdef>.
> > The strange thing is that in the output I _have_ </contain> !!! :-O
> > 
> > So I looked in th AbstractTransformer I extend.
> > 
> > Why is it
> > 
> >    /**
> >      * End the scope of a prefix-URI mapping.
> >      */
> >     public void endPrefixMapping(String prefix)
> >     throws SAXException {
> >     }
> > 
> > and not
> > 
> >    /**
> >      * End the scope of a prefix-URI mapping.
> >      */
> >     public void endPrefixMapping(String prefix)
> >     throws SAXException {
> >         if (super.contentHandler!=null)
> >         System.out.println("PM!"+prefix);
> >             super.contentHandler.endPrefixMapping(prefix);
> >     }
> > 
> >  ?
> > 
> > Thanks guys :-)
> 
> Because you found a bug :)
> 
> Fixing it right away...

If it can help, the problem hase gone away with Xerces 1.2 (the latest).

Cheers

nicola_ken


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