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Guice 3 is just around the corner, but I cannot find a page telling me what's new in this version. So, what's new in Guice 3?
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Beyond Dependency Injection, the benefits of using Google Guice is: Guice has a very clean implementation of constructor Injection. As you can see from the example you just add @Inject annotation constructor. Guice also has setter Injection using the same annotation.
Dependency Injection for Java Developers with Dagger & Guice Guice provides another way also to map bindings without creating a custom annoation. It allows so using @Named annotation.
The Module is the core building block for an Injector which is Guice's object-graph builder. First step is to create an injector and then we can use the injector to get the objects. public static void main(String[] args) { /* * Guice.createInjector() takes Modules, and returns a new Injector * instance.
Annotation Type Inject. @Target(value={METHOD,CONSTRUCTOR,FIELD}) @Retention(value=RUNTIME) @Documented public @interface Inject. Annotates members of your implementation class (constructors, methods and fields) into which the Injector should inject values.
The Guice 3.0 wiki page has a whole section entitled "New Features" along with a bit on migration.
I suspect that the feature which is in some ways most welcome while also not providing genuinely new functionality is JSR 330 integration.
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