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

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This exception has no message.
at org.apache.struts.tiles.TilesRequestProcessor.initDefinitionsMapping(
at org.apache.struts.tiles.TilesRequestProcessor.init(
at org.apache.struts.action.ActionServlet.getRequestProcessor(
at org.apache.struts.action.ActionServlet.destroyModules(
at servletunit.struts.MockStrutsTestCase.tearDown(
at junit.framework.TestCase.runBare(
at junit.framework.TestResult$1.protect(
at junit.framework.TestResult.runProtected(
at junit.framework.TestSuite.runTest(
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(

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