Guice bind().toInstance() injects already injected members?

Question

I have multiple injectors in a multi module project, and want to pass an already injected instance from module A to another Guice module B:

//module B    
bind(DeleteEmployeeUseCaseFactory.class).toInstance(useCaseFactories);
//usecaseFactories comes from module A, and already injected

However this results binding exception in module B as guice tries to re-inject "usecaseFactories" members in moduleB where those dependencies not binded.

Why guice try to inject given instance's members, and how to avoid that?

Answer 1

I solved to avoid injection of instance's already injected members by using Provider:

bind(DeleteEmployeeUseCaseFactory.class).toProvider(Providers.of(useCaseFactories));

However this is guice's expected behavior as decribed here:

Automatic Injection

Guice automatically injects all of the following:

• instances passed to toInstance() in a bind statement
• provider instances passed to toProvider() in a bind statement The objects will be injected while the injector itself is being created. If they're needed to satisfy other startup injections, Guice will inject them before they're used.