java.lang.ExceptionInInitializerError: java.lang.NullPointerException

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java.lang.NullPointerException
java.lang.ExceptionInInitializerError: java.lang.NullPointerException
at org.apache.struts.util.MessageResources.getMessageResources(MessageResources.java:577)
at org.apache.struts.util.RequestUtils.(RequestUtils.java:134)
at org.apache.struts.util.MessageResourcesFactory.createFactory(MessageResourcesFactory.java:192)
at org.apache.struts.util.MessageResources.getMessageResources(MessageResources.java:576)
at org.apache.struts.action.ActionServlet.initInternal(ActionServlet.java:1329)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at servletunit.struts.MockStrutsTestCase.getActionServlet(MockStrutsTestCase.java:179)
at servletunit.struts.MockStrutsTestCase.actionPerform(MockStrutsTestCase.java:228)

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