Configure the IdGenerator strategy to initialize {@code MessageHeaderAccessor}
instances with.
<p>By default this property is set to {@code null} in which case the default
IdGenerator of {@link hunt.stomp.MessageHeaders} is used.
<p>To have no ids generated at all, see {@link #setDisableIdGeneration()}.
Configure the IdGenerator strategy to initialize {@code MessageHeaderAccessor} instances with. <p>By default this property is set to {@code null} in which case the default IdGenerator of {@link hunt.stomp.MessageHeaders} is used. <p>To have no ids generated at all, see {@link #setDisableIdGeneration()}.