code: private ResourceBundle getResourceBundle(String name) {
  
          if (ivTC != null) {
              // The best odds for finding the resource bundle are with using the
              // classloader that loaded the associated class to begin with. Start
              // there.
              try {
                  return TraceNLS.getResourceBundle(ivTC.getClass(), name, Locale.getDefault());
              } catch (MissingResourceException ex) {
                  // no FFDC required
              }
          } else {
              try {
                  return TraceNLS.getResourceBundle(null, name, Locale.getDefault());
              } catch (MissingResourceException ex) {
                  // no FFDC required
              }
          }
  
          return null;
      }
docs: Worker method to load the resource bundle corresponding to the specified
  resource bundle name using the current default Locale.
  <p>
  
  @param resourceBundleName
  the name of the resource bundle. Must not be null.
  @return a reference to the resource bundle. Null if not found.