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Bug??

Bug??

2003-01-17       - By David N Bertoni/Cambridge/IBM
Reply:     1     2  





Hi Jon,

You should not get a null pointer exception, but you are doing something
unnatural.  '|' is a node-set union operator, not a logical "or" operator.
You cannot union two boolean expressions, which is what your expression is
trying to do.

Instead, you probably want this:

/gamebook/section/data/section/data/section[@(protected)='frontmatter' or @(protected)
='frontmatter-separate']

By the way, that's a very long path for a pattern.  Are you sure you can't
shorten it a bit and not match all the way up to the root?

Dave



                                                                             
                                       
                     Jonathan Blake                                          
                                       
                     <jonblake@(protected)         To:      xalan-j-users@(protected)
.apache.org                                    
                     .addr.com>               cc:      (bcc: David N Bertoni
/Cambridge/IBM)                            
                                              Subject: Bug??                  
                                       
                     01/17/2003 11:27                                        
                                       
                     AM                                                      
                                       
                     Please respond                                          
                                       
                     to jonblake                                              
                                       
                                                                             
                                       



I was spinning in circles for a while on this one. I get a Null pointer
error using the following files and command line. Is this a bug or am I
doing unnatural things with XSLT? I can work around this by removing the
"|" operation in the XSL and creating separate, identical templates, but
it would be cleaner the other way.

java org.apache.xalan.xslt.Process -IN 01fftd.xml -XSL xhtml-single.xsl
-OUT foo.html -V -EDUMP

-- XML file --
<?xml version="1.0" encoding="ISO-8859-1"?>

<gamebook>
<section id="title" />
 <data>
  <section class="frontmatter">
   <data />
  </section>
 </data>
</gamebook>

-- XSL file --
<?xml version="1.0"?>

<xsl:transform version="1.0"
 xmlns="http://www.w3.org/1999/xhtml"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="xml" />

<xsl:template match="section" />

<xsl:template match="*[@(protected)='title']">
<html>
 <body>
  <div>
   <xsl:apply-templates select="data/section[@(protected)='frontmatter']" />
  </div>
 </body>
</html>
</xsl:template>

<xsl:template
match="/gamebook/section/data/section/data/section[@(protected)='frontmatter' |
@(protected)='frontmatter-separate']" />

</xsl:transform>

Produces:

>>>>>>> Xalan Version Xalan Java 2.4.1, <<<<<<<

; SystemID:
file:///usr7/nscee/jblake/public_html/aon/data/xml/xhtml-single.xsl
javax.xml.transform.TransformerException: java.lang.NullPointerException
       at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2344)

       at
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode
(TransformerImpl.java:2160)

       at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java
:1213)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:668)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java
:1129)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java
:1107)

       at org.apache.xalan.xslt.Process.main(Process.java:1041)
---------
java.lang.NullPointerException
       at
org.apache.xpath.axes.UnionChildIterator.acceptNode(UnionChildIterator.java:134)

       at
org.apache.xpath.axes.BasicTestIterator.nextNode(BasicTestIterator.java:154)

       at
org.apache.xpath.axes.NodeSequence.nextNode(NodeSequence.java:321)
       at org.apache.xpath.objects.XNodeSet.compare(XNodeSet.java:538)
       at org.apache.xpath.objects.XNodeSet.equals(XNodeSet.java:736)
       at org.apache.xpath.operations.Equals.operate(Equals.java:84)
       at
org.apache.xpath.operations.Operation.execute(Operation.java:150)
       at org.apache.xpath.Expression.execute(Expression.java:199)
       at
org.apache.xpath.operations.Operation.execute(Operation.java:147)
       at
org.apache.xpath.patterns.StepPattern.executePredicates(StepPattern.java:765)

       at
org.apache.xpath.patterns.StepPattern.execute(StepPattern.java:443)
       at
org.apache.xalan.templates.TemplateList.getTemplateFast(TemplateList.java:593)

       at
org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes
(ElemApplyTemplates.java:326)

       at
org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java
:216)

       at
org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes
(ElemApplyTemplates.java:425)

       at
org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java
:216)

       at
org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes
(ElemApplyTemplates.java:425)

       at
org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java
:216)

       at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2339)

       at
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode
(TransformerImpl.java:2160)

       at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java
:1213)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:668)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java
:1129)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java
:1107)

       at org.apache.xalan.xslt.Process.main(Process.java:1041)

--
Jon Blake