DO NOT REPLY [Bug 24842] New: - java.lang.NullPointerException in first test -- thread synchronization prob?

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=24842

java.lang.NullPointerException in first test -- thread synchronization prob?

           Summary: java.lang.NullPointerException in first test -- thread
                    synchronization prob?
           Product: Cactus
           Version: 1.5-rc1
          Platform: PC
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Framework
        AssignedTo: cactus-dev@jakarta.apache.org
        ReportedBy: z0084@zorzella.com


I've written a fairly simple test case to test a servlet of mine. I log in, as
required, and do a "doGet":

    public void testOne () throws javax.servlet.ServletException {
        ShowLinks servlet = new ShowLinks ();
        servlet.init (config);
        UserValue user = LFGetter.findUserByUsername("user");
        Login.login (request, user);
        servlet.doGet (request, response);
    }

This is the only test case in my Cactus suite. Right after deploying it to my
jboss (jboss-3.2.2), and testing over the browser (with ServletTestRunner), I
found out that Cactus reports a failure in this test. If I hit "reload" on the
browser it reports success (and keeps on reporting sucess from then on). If I
redeploy the EAR file, the same happens: the first time failure, afterwards,
success. The failure happens with a Cactus NullPointerException (the Exception
is at the framework itself, not in my servlet), which I narrowed down to this
line in the method doGetResults():

            writer.write(result.toXml());

The reason for the exception is that "result" is null. "result" is populated
right before that with this line:

        WebTestResult result = (WebTestResult) (this.webImplicitObjects
            .getServletContext().getAttribute(TEST_RESULTS));

I've also figured that it is set in the servletContext by this line in doTest():

        this.webImplicitObjects.getServletContext()
            .setAttribute(TEST_RESULTS, result);

That comes right after the servlet itself is excecuted, from the line:

            testInstance.runBare();

After more debugging, I figured out the this "runBare" will open a secondary
thread, which will execute the "doGetResults()", while the "current thread" will
be the one that continues the execution of "doTest()".

***************************************

WHAT I THINK:

The way I see it, the second thread should wait for the first one to set
"TEST_RESULTS" before it executes "doGetResults()". And I think the reason it
succeeds from the second test onwards is that this is cached from one run to the
next.

Please let me know if you need more information.

Zorzella

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