[AXIS-1538] getParentNode returns null on Envelopes

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: beta-3
• Component/s: SAAJ
• Environment: Windows 2000, JDK 1.3
• Assignee: Unassigned
• Reporter: Michael Theroux
• Created: 31/Aug/04 20:17
• Updated: 15/Oct/04 17:51

Description

I am attempting to run an XSLT directly against a result SOAPEnvelope and have hit a couple of issues. I worked around bug AXIS-1537 using a local Axis build. The next issue I got is demonstrated by the following code snippet:

/*

• Copyright 2001-2004 The Apache Software Foundation.
  *
• Licensed under the Apache License, Version 2.0 (the "License");
• you may not use this file except in compliance with the License.
• You may obtain a copy of the License at
  *
• http://www.apache.org/licenses/LICENSE-2.0
  *
• Unless required by applicable law or agreed to in writing, software
• distributed under the License is distributed on an "AS IS" BASIS,
• WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
• See the License for the specific language governing permissions and
• limitations under the License.
  */
  import org.apache.axis.client.Call;
  import org.apache.axis.client.Service;

import javax.xml.namespace.QName;

public class Test
{
public static void main(String [] args) {
try {
String endpoint =
"http://webservices.sonicsw.com:8080/axis/CreditCheck.jws";

Service service = new Service();
Call call = (Call) service.createCall();

call.setTargetEndpointAddress( new java.net.URL(endpoint) );
call.setOperationName(new QName("http://webservices.sonicsw.com:8080/axis/CreditCheck.jws", "checkCredit") );

// Call to addParameter/setReturnType as described in user-guide.html
call.addParameter("custid",
org.apache.axis.Constants.XSD_STRING,
javax.xml.rpc.ParameterMode.IN);
call.addParameter("amount",
org.apache.axis.Constants.XSD_FLOAT,
javax.xml.rpc.ParameterMode.IN);
call.setReturnType(org.apache.axis.Constants.XSD_BOOLEAN);

Boolean ret = (Boolean) call.invoke( new Object[]

{ "1234", new Float( 1.24 ) }

);
org.w3c.dom.Node n = call.getResponseMessage().getSOAPEnvelope();
// n.getPreviousSibling();
org.w3c.dom.Node parentNode = n.getParentNode();
if( parentNode == null )
System.err.println( "PARENT NODE IS NULL!" );

// String test = com.sonicsw.xqimpl.script.Util.getElementAsString( (org.w3c.dom.Element)n, true );
String test = org.apache.axis.utils.DOM2Writer.nodeToString( n, true );
System.out.println("Resulting XML: " + test );

} catch (Exception e)

{ e.printStackTrace(); System.err.println(e.toString()); }

}
}

What happens is n.getParentNode() returns null. This causes my particular XSLT transformation engine not to perform a transform because, if the parentNode is null. This results in the transformer resulting in and exception "Supplied element is not within a Document"

This error jives with the javadoc for org.w3c.dom.Node:

getParentNode

public Node getParentNode()

The parent of this node. All nodes, except Attr, Document, DocumentFragment, Entity, and Notation may have a parent. However, if a node has just been created and not yet added to the tree, or if it has been removed from the tree, this is null.

Is this the intended behavior? Is the SOAPEnvelope node intended not to be part of a tree?

A workaround is to call getAsDOM() on the Envelope.

However, performance may make this undesireable. getAsDOM() will cause Axis's object model to be serialized as a string, then a subsequent deserialization will occur to create a native DOM because of performanceit results in a serialization of Axis's DOM structure to a string, then another deserialization occurs to create a DOM in your parser (such as Xerces).