regarding xmlbeans threadsafety

Hi,

I am having some threadsafety issues with testng tests run in parallel
mode. The tests involve connecting to a webservice using spring-ws
configured with xmlbeans marshalling. After reading [1], i was
wondering if the thread safety issue could apply to my case. I will
try to explain with a small block of code that does the webservice
call

    Object o1 = null;
    GetPaymentDocumentDocument1 requestDocument = null;
    try {
        requestDocument = GetPaymentDocumentDocument1.Factory.newInstance();
        requestDocument.addNewGetPaymentDocument();
        GetPaymentDocumentRequest request =
GetPaymentDocumentRequest.Factory.newInstance();
        requestDocument.getGetPaymentDocument().setRequest(request);
        o1 = PaymentWebService.marshalSendAndReceive(requestDocument);
        // POTENTIAL CCE BELOW
        GetPaymentDocumentResponseDocument responseDocument =
(GetPaymentDocumentResponseDocument) o1;
        return responseDocument.getGetPaymentDocumentResponse().getDocument();
    } catch (ClassCastException cce) {
        throw new RuntimeException(
                 (o == null ? "NULL" : o.getClass() + "___" +
o.getClass().getClassLoader()) + ">>>>"
                +
GetPaymentDocumentResponseDocument.class.getClassLoader() + ">>>>>>\n"
+ o, cce);
    }

In normal non-parallel testing, this code never fails. Recently
however i switched the tests to be run in parallel through TestNG's
parallel=methods feature, meaning that a thread pool is assigned to
execute methods from the test class concurrently.

Since then, the above block of code randomly throws CCE's when i try
to cast the object returned from the webservice to the
"GetPaymentDocumentResponseDocument". After doing some research i
found that o1 as returned from the webservice in these cases is
actually an instance of GetPaymentDocumentDocument1 (ie the request
document) !

Could this problem be related to XmlBeans ? Following [1] I built
xmlbeans myself from source a few weeks ago but that didn't change
anything. Any thoughts would be greatly appreciated. I tried to narrow
things down to a small testcase but i could never consistently
reproduce it.

Thanks !
Jorg

[1] http://www.mail-archive.com/[email protected]/msg03818.html