Upgrading results in WebServiceTransportException: Internal Server Error [500]

We have a working environment using Spring Framework 2.0.6 and Spring-WS 1.0.0. Upgrading to Spring 2.5.5 and Spring 1.5.3 results in -

Code:

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org.springframework.ws.client.WebServiceTransportException: Internal Server Error [500]
at org.springframework.ws.client.core.WebServiceTemplate.handleError(WebServiceTemplate.java:590)
at org.springframework.ws.client.core.WebServiceTemplate.doSendAndReceive(WebServiceTemplate.java:514)
at org.springframework.ws.client.core.WebServiceTemplate.sendAndReceive(WebServiceTemplate.java:465)
at org.springframework.ws.client.core.WebServiceTemplate.marshalSendAndReceive(WebServiceTemplate.java:314)
at org.springframework.ws.client.core.WebServiceTemplate.marshalSendAndReceive(WebServiceTemplate.java:308)
at org.springframework.ws.client.core.WebServiceTemplate.marshalSendAndReceive(WebServiceTemplate.java:300)
at org.unavco.esdp.gateway.ws.InContainerCheckPackageServiceTest.initiatePackageDataAction(InContainerCheckPackageServiceTest.java:87)
at org.unavco.esdp.gateway.ws.InContainerCheckPackageServiceTest.testPackageURLRetrievable(InContainerCheckPackageServiceTest.java:23)

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Reverting back eliminates the error.

Can anyone make any suggestions on what may be causing this error?

Using XmlBeans 2.3, SAAJ 1.3 and Tomcat 5.5.26 (started by Cargo in this test environment).

I can not use SW 1.x.... We are using 1.5.7.
Is there any way to resolve this issue?

Approx. 3 out of 50 times, we get that error.....

Response headers:
HTTP/1.1 500 Internal Server Error
Content-Type: text/html;charset=UTF8
$WSEP:
Content-Language: en-US
Content-Length: 64
Set-Cookie: JSESSIONID=0000Zs33S8lpPrXvxa73FJUQpu9:-1; Path=/
Connection: Close
Date: Tue, 23 Jun 2009 14:44:51 GMT
Server: WebSphere Application Server/6.1
Expires: Thu, 01 Dec 1994 16:00:00 GMT
Cache-Control: no-cache="set-cookie, set-cookie2"


Caused by: org.springframework.ws.client.WebServiceTransportE xception: Internal Server Error [500]
at org.springframework.ws.client.core.WebServiceTempl ate.handleError(WebServiceTemplate.java:627)
at org.springframework.ws.client.core.WebServiceTempl ate.doSendAndReceive(WebServiceTemplate.java:551)
at org.springframework.ws.client.core.WebServiceTempl ate.sendAndReceive(WebServiceTemplate.java:502)
at org.springframework.ws.client.core.WebServiceTempl ate.doSendAndReceive(WebServiceTemplate.java:457)
at org.springframework.ws.client.core.WebServiceTempl ate.sendSourceAndReceiveToResult(WebServiceTemplat e.java:403)
at org.springframework.ws.client.core.WebServiceTempl ate.sendSourceAndReceiveToResult(WebServiceTemplat e.java:394)

Any help?

I encounter the same error. any idea how to resolve this issue?