Please cherry-pick:

Please cherry-pick:
- removed event-observing methods from interfaces as they should not be called
  from other beans, but only invoked when the specific event has been fired.
- remember these guide-lines:
  1) Use interface for type-hinting objects, not direct class name.
  2) All methods in interface are considered as callable (by you)
  3) If you still need public methods (like it is needed for @PostConstruct or
     @Observes) don't add that method to interface.
  4) This way, the interface is clean and simple (KISS), no exceptions (of,
     course thrown ...)!

Signed-off-by: Roland Häder <roland@mxchange.org>