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From axis-...@ws.apache.org
Subject [jira] Commented: (AXIS-1537) getPreviousSibling results in NullPointerException on Envelopes
Date Thu, 02 Sep 2004 16:21:50 GMT
The following comment has been added to this issue:

     Author: Attila Uhljar
    Created: Thu, 2 Sep 2004 9:21 AM
       Body:
I also had the problem you described. It is actually a result of 2 bugs in Axis:
1. The implementation of getPreviousSibling is incorrect
2. When the document tree is created, Text nodes will not have parent nodes assigned (getParent
returns null).
The outcome is that the tree walking algorithm gets 'stuck' and eventually crashes with NullPointerException.
I have fixes for both issues but really don't have time to find out how to submit them. Could
you (or somebody else do it please?
I'll try to attach the diff files for both MessageElement.java and NodeImpl.java.
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View this comment:
  http://issues.apache.org/jira/browse/AXIS-1537?page=comments#action_39516

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View the issue:
  http://issues.apache.org/jira/browse/AXIS-1537

Here is an overview of the issue:
---------------------------------------------------------------------
        Key: AXIS-1537
    Summary: getPreviousSibling results in NullPointerException on Envelopes
       Type: Bug

     Status: Unassigned
   Priority: Minor

    Project: Axis
   Versions:
             beta-3

   Assignee: 
   Reporter: Michael Theroux

    Created: Tue, 31 Aug 2004 1:03 PM
    Updated: Thu, 2 Sep 2004 9:21 AM
Environment: Windows 2000, JDK 1.3

Description:
I am attempting to run an XSLT directly against a result SOAPEnvelope and have hit a couple
of issues.

One issue is that SOAPEnvelope.getPreviousSibling() will result in a NullPointerException.
 Below is a 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();
/*           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());
       }
   }
}

n.getPreviousSibling() throws a NullPointerException.

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).


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