* @param id
* the <code>JmsMessageId</code> of the source JMS message, or <code>null</code>
* if this transformation does not use a JMS message as source.
*/
public void setSourceJmsMessage(JmsMessageId id) {
JmsMessageId old = getSourceJmsMessageId();
boolean differs = !KongaID.areEqual(old, id);
setProperty(SOURCE_JMS_MESSAGE_ID, (id != null) ? id.toString() : null);
if (differs) {
firePropertyChange(SOURCE_JMS_MESSAGE_ID, old, id);
}