Guice - How to share the same Singleton instance through multiple injectors/modules

Question

In guice, the @Singleton scope does not refer to the Singleton pattern.

According to the \"Dependency Injection\" book of \"Dhanji\" :

Very si

Answer 1

You can use Injector.createChildInjector:

// bind shared singletons here
Injector parent = Guice.createInjector(new MySharedSingletonsModule());
// create new injectors that share singletons
Injector i1 = parent.createChildInjector(new MyModule1(), new MyModule2());
Injector i2 = parent.createChildInjector(new MyModule3(), new MyModule4());
// now injectors i1 and i2 share all the bindings of parent