[ANN]: Jersey 2.0 w/ Guice

[Roger Kapsi]

We're using Guice at Squarespace and a different project we depend on is about to switch to Jersey 2.0. We've therefore taken a dive into HK2 and figured out why it didn't play nice with Guice (see JERSEY-2551). They fixed it in Jersey 2.11+ and the library is backwards compatible to Jersey 2.9.x.

  https://github.com/Squarespace/jersey2-guice

We hope it's useful for other Guice users and contributions and feedback are very welcome.

Thanks,

 Roger

[John Wells]

Another really gr8 page about this is here:

https://github.com/mycom-int/jersey-guice-aop

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[Gili]

Great idea. I haven't tested this myself but this sounds like it would work.

I hope to hear some validation from people actually using this library.

Gili

[David Parish]

This really is terrific and very helpful.  Can you add a working sample webapp to help folks get started quickly?

[Alexander Openkowski]

+1 for a working sample webapp, please!

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[David Parish]

I think I'm pretty close.  Here's the GuiceConfig I'm using:

public class GuiceServletConfig extends JerseyGuiceServletContextListener {

    @Override

    protected List<? extends Module> modules() {

        AbstractModule module = new ServletModule() {

            @Override

            protected void configureServlets() {

                // bind the rest resource.

                bind(EngineResource.class);

                /* bind jackson converters for JAXB/JSON serialization */

                bind(MessageBodyReader.class).to(JacksonJaxbJsonProvider.class);

                bind(MessageBodyWriter.class).to(JacksonJaxbJsonProvider.class);

                // general use bindings.

                bind(EngineInvoker.class).to(GroovyEngine.class);

                bind(ResourceLoader.class).to(ActivititiResourceProvider.class);

                serve("/rest/*").with(JerseySingletonServlet.class);

            }

            @Provides

            @Singleton

            ProcessEngine getProcessEngine() {

                return ProcessEngines.getDefaultProcessEngine();

            }

        };

        return Lists.newArrayList(module);

    }

}

JerseySingletonServlet is just an extension of ServletContainer tagged as a Singleton. The problem is that the binding for the resource doesn't seem to be picked up. I get 404's for all the jersey paths.

[Roger Kapsi]

https://bitbucket.org/marshallpierce/guice-jaxrs-examples

Hope that helps. 

-Roger

[Jeff Schnitzer]

If anyone is looking for something more plug-and-play, I've wrapped the Squarespace plugin in a dropwizard-like toolkit. Here's a stripped-down example GWizard service:

public class Main {
    @Path("/hello")
    public static class HelloResource {
        @GET
        public String hello() {
            return "hello, world";
        }
    }

    public static class MyModule extends AbstractModule {
        @Override
        protected void configure() {
            bind(HelloResource.class);
        }
    }

    public static void main(String[] args) throws Exception {
        Guice.createInjector(new MyModule(), new JerseyModule()).getInstance(WebServer.class).startJoin();
    }
}

I personally think it's wiser to use the RESTEasy module, since it doesn't rely on manipulating private fields in Jersey, but if you are tied to Jersey this is probably the easiest option. The code and documentation are here:

https://github.com/stickfigure/gwizard

Cheers,

Jeff