composite:attributes action, actionListener, validator and valueChangeListener don't need the attribute method-signature

If you have a <composite:attribute> with name action, actionListener, validator or valueChangeListener the attribute method-signature does not need to be provided, because it is already know by the system. Furthermore you are not able to specify the right method-signature for actionListener and valueChangeListener since they now can receive one parameter or also zero parameters (see MYFACES-2541 for details).