junit.framework.AssertionFailedError: Error running action.perform(): class java.lang.NullPointerException - null

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Error running action.perform(): class java.lang.NullPointerException - null
junit.framework.AssertionFailedError: Error running action.perform(): class java.lang.NullPointerException - null	at junit.framework.Assert.fail(Assert.java:47)	at servletunit.struts.MockStrutsTestCase.actionPerform(MockStrutsTestCase.java:339)	at classmate.TestLoginAction.testSuccessfulLogin(TestLoginAction.java:28)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	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 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)