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java.lang.NullPointerException: 	at org.apache.struts.action.ActionServlet.parseModuleConfigFile(ActionServlet.java:1003)	at org.apache.struts.action.ActionServlet.initModuleConfig(ActionServlet.java:955)	at org.apache.struts.action.ActionServlet.init(ActionServlet.java:470)	at javax.servlet.GenericServlet.init(GenericServlet.java:211)	at servletunit.struts.CactusStrutsTestCase.getActionServlet(CactusStrutsTestCase.java:477)	at servletunit.struts.CactusStrutsTestCase.actionPerform(CactusStrutsTestCase.java:536)	at examples.cactus.TestCactusLoginAction.testSuccessfulLogin(TestCactusLoginAction.java:32)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at junit.framework.TestCase.runTest(TestCase.java:154)	at junit.framework.TestCase.runBare(TestCase.java:127)	at org.apache.cactus.internal.AbstractCactusTestCase.runBareServer(AbstractCactusTestCase.java:153)	at org.apache.cactus.internal.server.AbstractWebTestCaller.doTest(AbstractWebTestCaller.java:119)