private <T> T fromPolicyContext(Class<T> type) {
   try {
     return (T) PolicyContext.getContext(type.getName());
   } catch (Exception e) {
     //
   }
   return null;
 }
 @Override
 public Subject getContextSubject() {
   try {
     return (Subject) PolicyContext.getContext(SUBJECT_CONTEXT_KEY);
   } catch (PolicyContextException e) {
     throw new HibernateException(
         "Unable to access JACC PolicyContext in order to locate calling Subject", e);
   }
 }
 public HttpUserInfo(boolean enableDNSLookups) {
   try {
     HttpServletRequest rq = (HttpServletRequest) PolicyContext.getContext(WEB_REQUEST_KEY);
     init(rq, enableDNSLookups);
   } catch (PolicyContextException e) {
     userId = "UNKNOWN_USER";
   } catch (NullPointerException e) {
     // Thrown when mbean method is invoked by MDB
     userId = "SYSTEM";
   }
 }
 /**
  * Get the {@link HttpServletRequest} from the {@link MessageContext}
  *
  * @param msgContext
  * @return
  */
 private HttpServletRequest getHttpRequest(MessageContext msgContext) {
   HttpServletRequest request =
       (HttpServletRequest) msgContext.get(MessageContext.SERVLET_REQUEST);
   if (request == null) {
     try {
       request =
           (HttpServletRequest) PolicyContext.getContext("javax.servlet.http.HttpServletRequest");
     } catch (PolicyContextException e) {
       throw new RuntimeException(e);
     }
   }
   return request;
 }
  public void validateCertificateChain(List<X509Certificate> certificateChain)
      throws SecurityException {
    LOG.debug("validate certificate chain: " + certificateChain);

    HttpServletRequest httpServletRequest;
    try {
      httpServletRequest =
          (HttpServletRequest) PolicyContext.getContext("javax.servlet.http.HttpServletRequest");
    } catch (PolicyContextException e) {
      throw new RuntimeException("JACC error: " + e.getMessage());
    }

    HttpSession httpSession = httpServletRequest.getSession();
    httpSession.setAttribute("authenticationCertificateChain", certificateChain);
  }
  public void checkNationalRegistrationCertificate(List<X509Certificate> certificateChain)
      throws SecurityException {
    LOG.debug("checking national registry certificate...");

    HttpServletRequest httpServletRequest;
    try {
      httpServletRequest =
          (HttpServletRequest) PolicyContext.getContext("javax.servlet.http.HttpServletRequest");
    } catch (PolicyContextException e) {
      throw new RuntimeException("JACC error: " + e.getMessage());
    }

    HttpSession httpSession = httpServletRequest.getSession();
    X509Certificate certificate = certificateChain.get(0);
    httpSession.setAttribute("NationalRegistryCertificate", certificate);
  }