java.lang.ClassCastException: This exception has no message.

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java.lang.ClassCastException:
at org.apache.struts.tiles.TilesRequestProcessor.initDefinitionsMapping(TilesRequestProcessor.java:126)
at org.apache.struts.tiles.TilesRequestProcessor.init(TilesRequestProcessor.java:116)
at org.apache.struts.action.ActionServlet.getRequestProcessor(ActionServlet.java:872)
at org.apache.struts.action.ActionServlet.destroyModules(ActionServlet.java:725)
at servletunit.struts.MockStrutsTestCase.tearDown(MockStrutsTestCase.java:127)
at com.org.emp.action.TestEmpLog.tearDown(TestEmpLog.java:31)
at junit.framework.TestCase.runBare(TestCase.java:130)
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 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)

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