Comment #100 on issue 62 by [email protected]: Lifecycle support http://code.google.com/p/google-guice/issues/detail?id=62
You need @PostConstruct because that would only be invoked after ALL dependencies have been injected - both the constructor *and* field/methods.
This because you might need some service of some injected instance to start up. And that instance was injected by means of field injection. No good with constructor startup then.
Also, according to JCIP IIRC, one shall not leak unfinished objects. In a constructor, you could e.g. register yourself with the OnIncomingUserEventService, and *then* your object instantiation crashes with a NPE for some other reason. Therefore, thou shall not ever do "startup stuff" in a constructor. Only construct yourself, do not e.g. attach yourself to other object graphs.
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