java.io.IOException: Server returned HTTP response code: 503 for URL while using AXIS2 API along with AXIS, Apache httpclient, XML parsing APIs

[kalyanG <g....@gmail.com>]

I'm adding the following fragment to the existing application that is already
communicating with another Web application for a service at the end of the
program/app workflow using java.net.HttpURLConnection  and java.net.URL
classes for "http://www.testURL.com/service/send.do"

/**** CODE SNIPPET STARTS ****/
// Enable logging 
System.setProperty("org.apache.commons.logging.Log","org.apache.commons.logging.impl.SimpleLog"); 
System.setProperty("org.apache.commons.logging.simplelog.showdatetime",
"true"); 
System.setProperty("org.apache.commons.logging.simplelog.log.httpclient.wire.header",
"debug"); 

String url = "http://testServicehost.com/service/myTestWebService"; //I use
this in a method to get the response back 
HttpTransportProperties.Authenticator auth = new
HttpTransportProperties.Authenticator(); 
auth.setUsername ("user1"); 
auth.setPassword("passwd1"); 
auth.setDomain("DOMAIN"); 
auth.setHost("testServicehost.com"); 
List authPrefs = new ArrayList (1); 
authPrefs.add (AuthPolicy.NTLM); 
auth.setAuthSchemes (authPrefs); 
MyTestWebServiceSoapStub stub = new MyTestWebServiceSoapStub(url); 
stub._setProperty(org.apache.axis2.transport.http.HTTPConstants.AUTHENTICATE,
auth); // Webservice requires authentication
MyWSResponse res = stub.getXXXX();
res.getData(); 
//blah.. blah.. blah..

/**** CODE SNIPPET ENDS ****/

Problem:
Above code works fine and gets the desired data from "myTestWebService". but
I'm getting the error "java.io.IOException: Server returned HTTP response
code: 503 for URL"for the code that uses java.net.HttpURLConnection  and
java.net.URL to access "http://www.testURL.com/service/send.do" and sends an
XML.we could see http connection is aborted by this (client) app immidiately
or after 
transferring part of the XML data to the testURL.com URL(some data received
by testURL.com)

Error:
java.io.IOException: Server returned HTTP response code: 503 for URL:
http://www.testURL.com/service/send.do 

Environment/APIs used:
Its a web application deployed in IBM websphere server 6.0, Java 6.0. axis(I
think its ver.1 previous to axis2)(jar files:Activation, log4j,
xalan.xerces..), JAXB, SAX and xpath parsers, apache httpclient.. in the ,
application for XML parsing, marshalling/unmarshalling and AXIS2(ver 1.5.4)
for accessing myTestWebService AXIS2 jars added to existing application..
added by trial & err, added each jar whenever I get ClassNotFoundException
axiom-api-1.2.10.jar
axiom-impl-1.2.10.jar
axis2-adb-1.5.4.jar
axis2-kernel-1.5.4.jar
axis2-transport-http-1.5.4.jar
axis2-transport-local-1.5.4.jar
geronimo-annotation_1.0_spec-1.1.jar
httpcore-4.0.jar
neethi-2.0.4.jar
wstx-asl-3.2.9.jar
XmlSchema-1.4.3.jar
Application also hosts a webservice, gets 100 webservice requests per minute
and goes through above workflow. Please note that we didn't close the http
connection or disconnect http connection in the code for both
"myTestWebService" and "testURL.com" URL. XML to testURL.com contains DTD in
DOCTYPE (url:http://www.testURL.com/service/send.dtd)

Observation:
We tried increasing connection timeout/socket timeout in AXIS2
org.apache.axis2.client.Options object,no use. Looks wierd but only after
removing the axis2 jar library files and MyTestWebServiceSoapStub code from
apllication(rollback to previous version), it works fine. We are not geting
"java.io.IOException: Server returned HTTP response code: 503" http
connection issues for testURL.com URL anymore.

Solution required:
1. Need to know why AXIS2(ver. 1.5.4) causing java.net.HttpURLConnection to
abort connection and gives "java.io.IOException: Server returned HTTP
response code: 503 for URL: http://www.testURL.com/service/send.do" Required
root cause for this behaviour.
2. Solution using AXIS2 library provided we get rid of "Server returned HTTP
response code: 503" http connection problem.

Your help in this regard is much appreciated. Thanks-Kalyan
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