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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:393) at servletunit.ServletContextSimulator.setAttribute(ServletContextSimulator.java:527) at org.apache.struts.validator.ValidatorPlugIn.init(ValidatorPlugIn.java:164) at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:869) at org.apache.struts.action.ActionServlet.init(ActionServlet.java:336) at javax.servlet.GenericServlet.init(GenericServlet.java:212) at servletunit.struts.MockStrutsTestCase.getActionServlet(MockStrutsTestCase.java:326) at servletunit.struts.MockStrutsTestCase.actionPerform(MockStrutsTestCase.java:394) at com.siemens.ada.Junit.struts.popup.TestPopup.testPopupShow(TestPopup.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:164) at junit.framework.TestCase.runBare(TestCase.java:130) 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:120) at junit.framework.TestSuite.runTest(TestSuite.java:230) at junit.framework.TestSuite.run(TestSuite.java:225) at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)