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In most cases, services are injected by matching just the type; there is no @InjectService annotation, just a method or constructor parameter whose type matches the service's interface.

In this case, it is very easy to supply your own alternate implementation of a service, by contributing a Service Override in your module class (usually AppModule.java), like this:

  @Contribute(ServiceOverride.class)
  public static void setupApplicationServiceOverrides(MappedConfiguration<Class,Object> configuration)
  {
    configuration.addInstance(SomeServiceType.class, SomeServiceTypeOverrideImpl.class);
  }

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Sometimes you'll want to define the override as a service of its own: this . This is useful if you want to inject a Logger specific to the service, or if the overriding implementation needs a service configuration:

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