How to have a Guice module use another Guice module?

Question

Let's say I have a Guice module ProdModule that I would like to depend on other GuiceModules, ProdDbModule and ProdPubSubModule. How would I implement ProdModule's configure()?

Answer 1

You would install your other modules

protected void configure(){     install(new ProdDbModule());     install(new ProdPubSubModule());     // etc. } 

Answer 2

While it can be convenient to use install, you don't even need to install the other modules as long as you provide all the necessary modules when you create your Injector:

Injector injector = Guice.createInjector(new ProdDbModule(),     new ProdPubSubModule(), new ProdModule()); 

This can give you more flexibility to change out just one of these modules in your entry point class without needing to modify ProdModule itself. You can also indicate in a module what bindings it requires other modules to provide using the requireBinding methods.