Guice / Resteasy Integration

This is Guice integrated with Resteasy, done the right way (Guice-first).

Guiceeasy is built with/for:

Java 17+
Guice 6+
Resteasy 6+
The jakarta.* namespace (not javax.*)

A little history

Long ago, Resteasy provided an extension that integrated with Guice. This extension was problematic because it took a Resteasy-centric view of your application - Resteasy was "the app" which created your Guice injector. This is inside-out; Resteasy is something you should create/mount inside of Guice.

GWizard is inherently Guice-first, so we found (hacked) a way around this, using the resteasy-guice extension code.

Then Resteasy abandoned and removed the resteasy-guice extension entirely.

So we rebuilt the integration from scratch. And it turns out this was quite easy - there's only a few dozen lines of code.

How To Use

Guiceeasy is usable by any Guice project, not just GWizard (though of course, GWizard uses it). There are only two required steps:

Add the GuiceeasyModule to your injector.
Mount the GuiceeasyFilterDispatcher or GuiceeasyHttpServletDispatcher exactly the way you would normallly mount a Resteasy FilterDispatcher or HttpServletDispatcher.

Here's an example:

public class MyExampleServletModule extends ServletModule {
    @Override
    protected void configureServlets() {
        install(new GuiceeasyModule());

        // See the documentation for Resteasy HttpServletDispatcher for options
        final Map<String, String> initParams = ImmutableMap.of("resteasy.servlet.mapping.prefix", "/api");
        serve("/api/*").with(GuiceeasyHttpServletDispatcher.class, initParams);
    }
}

Note that you probably want to bind a ContextResolver<ObjectMapper> in your Guice injector that provides your custom ObjectMapper; simply binding the resolver into the injector registers it with Resteasy.

You can look at GWizard RestModule as an example. Of course, you can also just use GWizard!

gwizard/guiceeasy

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