OADialogPage message in controller extension in oaf

The below code perform based on some condition and invokes warning message and user click OK button to proceed further

   if (oapagecontext.getParameter("paApply")!=null)
   {
String msg = " ";
MessageToken tkns[] = null;
msg = oapagecontext.getMessage("XX","XX_ADJ_MSG",tkns);
OAException message = new OAException(msg);
OADialogPage dialogPage = new OADialogPage(OAException.WARNING, message, null, "",null);
dialogPage.setOkButtonItemName("SaveYesButton");
dialogPage.setOkButtonToPost(true);
dialogPage.setOkButtonLabel("Ok");
oapagecontext.writeDiagnostics(this,"setPostToCallingPage: ",6);
dialogPage.setPostToCallingPage(true);
       oapagecontext.redirectToDialogPage(dialogPage);
    }

---Always add the handle as separate if condition
if (oapagecontext.getParameter("SaveYesButton")!=null)
{
System.out.println("Continue");
oapagecontext.writeDiagnostics(this,"Continue: ",6);
oapagecontext.writeDiagnostics(this,"paApply: "+oapagecontext.getParameter("paApply"),6);
oapagecontext.putParameter("paApply", new String("paApply"));
oapagecontext.writeDiagnostics(this,"paApply1: "+oapagecontext.getParameter("paApply"),6);
super.processFormRequest(oapagecontext, oawebbean);
}