code: @SuppressWarnings("unchecked")
    final static Map<String,Object> getDefaultJNDIProperties(Class<? extends JmsDestinationImpl> clazz) {
      Map<String,Object> answer = defaultJNDIProperties.get(clazz);
  
      // Ensure we get the empty map if there are no default properties
      if (answer == null) answer = Collections.EMPTY_MAP;
  
      return answer;
    }
docs: /*
  getDefaultJNDIProperties
  Returns a map of property names and values that lists the properties
  (and their defaults) that need to suppressed from the JNDI
  reference if their values are those default values
  @param clazz The class for which we need the set of default jndi properties
  @return Map<String,Object> the map of property names and defaults values