Hi, Kumar.
Kumar Pandey <[EMAIL PROTECTED]> wrote on 2005-06-05 04:39:39 PM:
> jdk :1.5.0_02-b09
> xalan: 2.6.0
>
> I'm creating a static template using
> TransformerFactory.newTemplates().
> creation block is synchronized as it gets called in a
> servlet.
>
> Then for each web request I create a new Transformer
> like so -
>
> transformerForARequest =
> staicTemplateInstance.newTransformer();
>
> Then I proceed with the transformation on xml data.
...
> java.lang.NullPointerException
> at
> org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.addNode(DOM2DTM.java:237)
> at
> org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.nextNode(DOM2DTM.java:539)
> at
It looks like the NullPointerException is being thrown from the
following piece of code - the line that checks whether name equals or
begins with "xmlns".
if (Node.ATTRIBUTE_NODE == type)
{
String name = node.getNodeName();
if (name.startsWith("xmlns:") || name.equals("xmlns"))
{
type = DTM.NAMESPACE_NODE;
}
}
It looks like the call to getNodeName() for an attribute node has
returned null. Is the same tree used a input for more than one
transformation at the same time? The DOM specification requires
multi-threaded access (even read access) to a DOM tree to be synchronized.
If each thread transforms its own DOM tree, how is the DOM tree created?
Is it possible that the fault lies there? Does the processor always throw
the NPE from the same line in DOM2DTM?
Thanks,
Henry
------------------------------------------------------------------
Henry Zongaro Xalan development
IBM SWS Toronto Lab T/L 969-6044; Phone +1 905 413-6044
mailto:[EMAIL PROTECTED]
