Program: 90527
Project: 90527
Buggy source:
@Override public void render(RenderRequest portletReq,RenderResponse portletResp) throws PortletException, IOException {
  long tid=Thread.currentThread().getId();
  portletReq.setAttribute(THREADID_ATTR,tid);
  PrintWriter writer=portletResp.getWriter();
  Map<String,String[]> oldmap=new HashMap<String,String[]>();
  for (  String name : portletReq.getParameterMap().keySet()) {
    String[] vals=portletReq.getParameterValues(name);
    vals=(vals == null) ? null : vals.clone();
    oldmap.put(name,vals);
  }
  String target=JSP_PREFIX + "String_Node_Str" + JSP_SUFFIX+ "String_Node_Str"+ QUERY_STRING;
  PortletRequestDispatcher rd=portletConfig.getPortletContext().getRequestDispatcher(target);
  rd.forward(portletReq,portletResp);
  Map<String,String[]> newmap=new HashMap<String,String[]>();
  for (  String name : portletReq.getParameterMap().keySet()) {
    String[] vals=portletReq.getParameterValues(name);
    vals=(vals == null) ? null : vals.clone();
    newmap.put(name,vals);
  }
  JSR286DispatcherTestCaseDetails tcd=new JSR286DispatcherTestCaseDetails();
  TestResult tr0=tcd.getTestResultFailed(V2DISPATCHERTESTS3S_SPEC2_19_FORWARDJSPRENDER_DISPATCH4);
  CompareUtils.mapsEqual("String_Node_Str",oldmap,"String_Node_Str",newmap,tr0);
  tr0.writeTo(writer);
}

Fixed version (ground truth):
@Override public void render(RenderRequest portletReq,RenderResponse portletResp) throws PortletException, IOException {
  long tid=Thread.currentThread().getId();
  portletReq.setAttribute(THREADID_ATTR,tid);
  String msg=(String)portletReq.getPortletSession().getAttribute(RESULT_ATTR_PREFIX + V2DISPATCHERTESTS3S_SPEC2_19_FORWARDJSPRENDER_DISPATCH4,APPLICATION_SCOPE);
  if (msg != null) {
    PrintWriter writer=portletResp.getWriter();
    writer.write(msg);
    portletReq.getPortletSession().removeAttribute(RESULT_ATTR_PREFIX + V2DISPATCHERTESTS3S_SPEC2_19_FORWARDJSPRENDER_DISPATCH4,APPLICATION_SCOPE);
  }
 else {
    StringWriter writer=new StringWriter();
    Map<String,String[]> oldmap=new HashMap<String,String[]>();
    for (    String name : portletReq.getParameterMap().keySet()) {
      String[] vals=portletReq.getParameterValues(name);
      vals=(vals == null) ? null : vals.clone();
      oldmap.put(name,vals);
    }
    String target=JSP_PREFIX + "String_Node_Str" + JSP_SUFFIX+ "String_Node_Str"+ QUERY_STRING;
    PortletRequestDispatcher rd=portletConfig.getPortletContext().getRequestDispatcher(target);
    rd.forward(portletReq,portletResp);
    Map<String,String[]> newmap=new HashMap<String,String[]>();
    for (    String name : portletReq.getParameterMap().keySet()) {
      String[] vals=portletReq.getParameterValues(name);
      vals=(vals == null) ? null : vals.clone();
      newmap.put(name,vals);
    }
    JSR286DispatcherTestCaseDetails tcd=new JSR286DispatcherTestCaseDetails();
    TestResult tr0=tcd.getTestResultFailed(V2DISPATCHERTESTS3S_SPEC2_19_FORWARDJSPRENDER_DISPATCH4);
    CompareUtils.mapsEqual("String_Node_Str",oldmap,"String_Node_Str",newmap,tr0);
    tr0.writeTo(writer);
    portletReq.getPortletSession().setAttribute(Constants.RESULT_ATTR_PREFIX + V2DISPATCHERTESTS3S_SPEC2_19_FORWARDJSPRENDER_DISPATCH4,writer.toString(),APPLICATION_SCOPE);
  }
}