code:     public void testUnsafeRedirectActionPrefix() throws Exception {
          Map parameterMap = new HashMap();
          parameterMap.put("redirectAction:" + "%{3*4}", "");
  
          StrutsMockHttpServletRequest request = new StrutsMockHttpServletRequest();
          request.setupGetServletPath("/someServletPath.action");
          request.setParameterMap(parameterMap);
  
          DefaultActionMapper defaultActionMapper = new DefaultActionMapper();
          defaultActionMapper.setContainer(container);
          ActionMapping actionMapping = defaultActionMapper.getMapping(request, configManager);
  
  
          StrutsResultSupport result = (StrutsResultSupport) actionMapping.getResult();
          assertNull(result);
      }
  
  