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

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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:1562)	at org.apache.struts.action.ActionServlet.initServlet(ActionServlet.java:1379)	at org.apache.struts.action.ActionServlet.init(ActionServlet.java:461)	at javax.servlet.GenericServlet.init(GenericServlet.java:258)	at servletunit.struts.MockStrutsTestCase.getActionServlet(MockStrutsTestCase.java:158)	at servletunit.struts.MockStrutsTestCase.actionPerform(MockStrutsTestCase.java:207)	at com.randomwalk.portfolio.tests.RWPActionTest.testSuccessfulListing(RWPActionTest.java:28)	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:166)	at junit.framework.TestCase.runBare(TestCase.java:140)	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:131)	at junit.framework.TestSuite.runTest(TestSuite.java:173)	at junit.framework.TestSuite.run(TestSuite.java:168)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:377)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:261)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:152)