Session Transformer

[Mariusz Sieraczkiewicz]

sitemap:
========
        <map:match pattern="sessionTest">
                <map:generate src="cocoon:/request-parameters"/>
                <map:transform src="context://engine/test/session.xsl" />
                <map:transform type="session" />
                <map:serialize type="xml"/>
        </map:match>
xsl (<session....> based on the example from doc):
==================================================
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:req-gen="http://apache.org/cocoon/request/2.0";
xmlns:session="http://apache.org/cocoon/session/1.0";>
<xsl:output method="html"/>

<xsl:param name="context" />

<xsl:template match="request-parameters">
 <test>
  <session:createcontext name="trackdemo"/>
  <!-- build context data -->
  <session:setxml context="trackdemo" path="/">
    <context>
      <users>
        <user id="1">
          <name>Carsten</name>
        </user>
      </users>
    </context>
  </session:setxml>
  <session:mergexml context="trackdemo" path="/context">
    <users>
      <user id="1">
        <name>Ziegeler</name>
        <developer>true</developer>
      </user>
      <user id="2">
        <name>Walter</name>
      </user>
    </users>
  </session:mergexml>
  <session:getxml context="trackdemo" path="/"/>
 </test>
</xsl:template>
</xsl:stylesheet>

(The template match really takes place, because when I comment
everything between <test>...</test> then output is OK (without
session tags of course).
Then I get:
===========
Original Exception: java.lang.RuntimeException: 
java.lang.RuntimeException: java.util.EmptyStackException
	at 
org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3364)
	at 
org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:427)
	at 
org.apache.cocoon.xml.AbstractXMLPipe.endDocument(AbstractXMLPipe.java:91)
	at 
org.apache.cocoon.transformation.TraxTransformer.endDocument(TraxTransformer.java:529)
	at 
org.apache.cocoon.generation.RequestGenerator.generate(RequestGenerator.java:215)
	at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:532)
	at 
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(AbstractCachingProcessingPipeline.java:196)
	at 
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline.java:683)
......................
......................

Run on Cocoon 2.1, Tomcat 4.0.

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