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java.lang.NullPointerException: 	at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:524)	at org.apache.crimson.parser.Parser2.parse(Parser2.java:305)	at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:442)	at org.apache.commons.digester.Digester.parse(Digester.java:1299)	at org.apache.struts.action.ActionServlet.initServlet(ActionServlet.java:1431)	at org.apache.struts.action.ActionServlet.init(ActionServlet.java:465)	at javax.servlet.GenericServlet.init(GenericServlet.java:258)	at servletunit.struts.MockStrutsTestCase.getActionServlet(MockStrutsTestCase.java:279)	at servletunit.struts.MockStrutsTestCase.actionPerform(MockStrutsTestCase.java:332)	at examples.TestLoginAction.testFailedLogin(TestLoginAction.java:49)	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 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.textui.TestRunner.doRun(TestRunner.java:116)	at junit.textui.TestRunner.doRun(TestRunner.java:109)	at junit.textui.TestRunner.run(TestRunner.java:72)	at junit.textui.TestRunner.run(TestRunner.java:57)	at examples.TestLoginAction.main(TestLoginAction.java:58)