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

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Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
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 com.ibm.crl.cfi.web.task.test.TestShowUnitAction.testSuccessfulShowUnit(TestShowUnitAction.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.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.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
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)

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