code: public void logWarning(String pMessage,
                             Throwable pRootCause)
              throws ELException {
          if (isLoggingWarning()) {
              if (mOut != null) {
                  if (pMessage == null) {
                      mOut.println(pRootCause);
                  } else if (pRootCause == null) {
                      mOut.println(pMessage);
                  } else {
                      mOut.println(pMessage + ": " + pRootCause);
                  }
              }
          }
      }
docs: Logs a warning