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java.lang.NullPointerException: 	at javax.servlet.GenericServlet.getServletContext(GenericServlet.java:204)	at org.apache.struts.action.ActionServlet.findMapping(ActionServlet.java:618)	at servletunit.struts.Common.getActionConfig(Common.java:260)	at servletunit.struts.Common.getActionForm(Common.java:222)	at servletunit.struts.CactusStrutsTestCase.getActionForm(CactusStrutsTestCase.java:650)	at demo.TestCactusOne.testOne1(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at org.apache.cactus.AbstractTestCase.runServerTest(AbstractTestCase.java:332)	at org.apache.cactus.AbstractTestCase.runBareServerTest(AbstractTestCase.java:235)	at org.apache.cactus.server.AbstractWebTestCaller.doTest(AbstractWebTestCaller.java:149)