Guava EventBus


The Guava EventBus is a Java library owned by Google. It is a event broadcasting system which implements an event/listener pattern.


  • Provides a mechanism for loose coupling between objects.


  • No returns codes/status/exceptions can be returned from This is an advantage that the oberserver pattern has over an event bus, as it can return values/catch excpetions.


Exceptions thrown by event handlers will not be caught by the function which called

Exception support has been discussed in Issue 766 in the Guava GitHub repository.