404 Errors?

I'm running some HttpUnit tests for a Struts/Tiles app hosted on OC4J
(10.1.2.02).  I currently have six different tests running, all against
the same form with different values.  Some of the tests succeed
normally, but others, hitting the same URL, throw a 404 error.  This is
the stacktrace that I get when I run it:
 
com.meterware.httpunit.HttpNotFoundException: Error on HTTP request: 404
Not Found [http://some.internal.server/emgmt_ext/index.do]
 at com.meterware.httpunit.WebClient.validateHeaders(WebClient.java:575)
 at com.meterware.httpunit.WebClient.updateClient(WebClient.java:464)
 at com.meterware.httpunit.WebWindow.updateWindow(WebWindow.java:139)
 at
com.meterware.httpunit.WebWindow.getSubframeResponse(WebWindow.java:130)
 at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:121)
 at com.meterware.httpunit.WebWindow.sendRequest(WebWindow.java:110)
 at com.meterware.httpunit.WebClient.sendRequest(WebClient.java:95)
 at
some.package.here.webtest.TestReportGeneration.beginTest(TestReportGener
ation.java:225)
 at
some.package.here.webtest.TestReportGeneration.testGenerateReport2(TestR
eportGeneration.java:63)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at junit.framework.TestCase.runTest(TestCase.java:154)
 at junit.framework.TestCase.runBare(TestCase.java:127)
 at junit.framework.TestResult$1.protect(TestResult.java:106)
 at junit.framework.TestResult.runProtected(TestResult.java:124)
 at junit.framework.TestResult.run(TestResult.java:109)
 at junit.framework.TestCase.run(TestCase.java:118)
 at junit.framework.TestSuite.runTest(TestSuite.java:208)
 at junit.framework.TestSuite.run(TestSuite.java:203)
 at junit.framework.TestSuite.runTest(TestSuite.java:208)
 at junit.framework.TestSuite.run(TestSuite.java:203)
 at
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUn
it3TestReference.java:128)
 at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.ja
va:38)
 at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTe
stRunner.java:460)
 at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTe
stRunner.java:673)
 at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRun
ner.java:386)
 at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRu
nner.java:196)
 
Does anybody know why this keeps happening?
 
Thanks,
 
Michael

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