[JXPath] - Question about JXPath in a Tomcat environment

[LANTRES Franck <fr...@fr.renault-sport-f1.com>]

Hi,

I'm using JXPath for just one week to query flat XML files.
While I do my unit tests, the soft is working well but as soon as it is
included in the final environment based on Tomcat and servlet, it
doesn't work.
Searching where comes from this problem, I added logs and here is what I
have found :
To get the XML nodes matching a XPath query, I have written :
JXPathContext ctx = JXPathContext.newContext(document);
String query = "<some XPath query";
Pointer ptr = ctx.getPointer(query);
return ptr.getNode().toString();

In standalone, the ptr.getNode() is a
org.apache.crimson.tree.ElementNode and I get the whole XML tags as a
string.
Using Tomcat, the ptr.getNode() is a
org.apache.xerces.dom.DeferredElementImpl and I get "null".

My first solution is to write a method to parse the NodeImpl and to
create the XML as a string.
Does exist a better solution ?


Thanks for your help.

Franck


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Re: [JXPath] - Question about JXPath in a Tomcat environment

[Adrian Perez Jorge <ap...@ignos.com>]

Hi!

http://xml.apache.org/xerces-j/apiDocs/org/apache/xerces/dom/NodeImpl.html#toString()

  If you check out the link above you will see toString() method should 
only be used for debugging purposes, and DOM standard has not such method.

  You were not very clear about what you mean with "the whole XML tag".  
I suppose you want the tag name, the attributes with their values and 
the XML representation of it's childs and text nodes, i.e. a String 
serialization of a Node (wich is more generic than the serialization of 
just Elements's).

http://xml.apache.org/xalan-j/apidocs/org/apache/xml/serializer/DOMSerializer.html

  Check out the above link and the related interface 
"SerializationHandler".  This is a specific serializer from xalan.

http://java.sun.com/developer/community/chat/JavaLive/2002/jl0827.html

  According the comments of Rajiv Mordani at the above link:

..."Currently, the way you can achieve the equivalent of 
|org.apache.xerces.serializer| is to use the Transform API from JAXP. 
Take a look at _the spec_ to see an example of how to use the 
transformer as a serializer. DOM Level 3 is going to have support for 
serialization, too"...

  The example is at page 20 of the JAXP 1.2 final relase.

  Cheers,

Adrian P.J.

LANTRES Franck wrote:

>Hi,
>
>I'm using JXPath for just one week to query flat XML files.
>While I do my unit tests, the soft is working well but as soon as it is
>included in the final environment based on Tomcat and servlet, it
>doesn't work.
>Searching where comes from this problem, I added logs and here is what I
>have found :
>To get the XML nodes matching a XPath query, I have written :
>JXPathContext ctx = JXPathContext.newContext(document);
>String query = "<some XPath query";
>Pointer ptr = ctx.getPointer(query);
>return ptr.getNode().toString();
>
>In standalone, the ptr.getNode() is a
>org.apache.crimson.tree.ElementNode and I get the whole XML tags as a
>string.
>Using Tomcat, the ptr.getNode() is a
>org.apache.xerces.dom.DeferredElementImpl and I get "null".
>
>My first solution is to write a method to parse the NodeImpl and to
>create the XML as a string.
>Does exist a better solution ?
>
>
>Thanks for your help.
>
>Franck
>
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
>
>  
>


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