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From what I can find online, the state of the art for Guice + Jersey integration has stagnated since 2008 when it appears both teams reached an impasse. The crux of the issue is that JAX-RS annotations perform field and method injection and this doesn't play nicely with Guice's own dependency injection.
A few examples which I've found don't go far enough to elucidate:
Iqbalyusuf's post on Jersey + Guice on Google App Engine Java suffers from a lot of boilerplate (manually getting and calling the injector). I want binding and injection should happen behind the scenes via Guice annotations.
Jonathan Curran's article Creating a RESTful service with Jersey, Guice, and JSR-250 gave me hope because it's much more current (2010), but went no further than showing how to start up a Jersey service inside of a Guice ServletModule. However, there are no examples of doing any real dependency injection. I suppose that was left as an exercise for the reader. Curran's post may in fact be the correct first step towards wiring up Guice and Jersey and so I plan on starting with that.
tantalizingly James Strachan writes:
JAX-RS works well with dependency injection frameworks such as Spring, Guice, GuiceyFruit or JBossMC - you can basically pick whichever one you prefer.
But I see no evidence that is true from a practitioner's point of view.
What I find lacking are practical examples and explanations on how to combine JAX-RS and Guice annotations. For instance:
Does anyone have examples, preferably with source, of non-trivial application which combines Jersey and Guice without sacrificing one or the other in the process? I'm keeping on this road regardless, but the bits and pieces on the Jersey and Guice lists makes me think I'm repeating the work of others who came before me.
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Spring allows you to omit the @Autowired annotation when there's only one constructor. Guice allows binding to a Provider, as well as injecting a Provider of your class, even when your class has no Provider binding.
The low level advantage of using Google Guice is a matter of cohesion in your application, your classes in the project can be loosely coupled between each other. I can provide a class for another class without them being dependent to each other.
Using GuiceIn each of your constructors that need to have something injected in them, you just add an @Inject annotation and that tells Guice to do it's thing. Guice figures out how to give you an Emailer based on the type. If it's a simple object, it'll instantiate it and pass it in.
A binding is an object that corresponds to an entry in the Guice map. You add new entries into the Guice map by creating bindings.
Guice integration with Jersey has not stagnated. The opposite is true. Thanks to Paul and his cohorts behind Jersey, the latest 1.7 release contains a special JerseyServletModule class to work with Guice-based servlets. Guice-based constructor injection into JAX-RS resource works! The issue is using JAX-RS annotations such as @QueryParam in the constructor of a JAX-RS resource. You don't need it! You use Guice for POJO injection all the way including singletons. Then JAX-RS is just icing on the cake for parsing HTTP-based RESTful APIs such as URL path, query parameters, content-type and etc. You don't need an "industrial strength" example either. Both Guice and Jersey are already battle tested. You just need a complete working example to see how it works. Then you can experiment advanced features on your own. Check out the following link for a complete example using Guice 3.0 and Jersey 1.7, which are all latest releases:
http://randomizedsort.blogspot.com/2011/05/using-guice-ified-jersey-in-embedded.html
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