Guice and general application configuration

Question

For a monitoring software written in Java I consider using Google Guice as DI provider. The project needs to load its configuration from an external resource (file or database).

Answer 1

Try Guice configuration available on maven central, it's support Properties, HOCON and JSON format.

You can inject properties from file application.conf to your service as :

@BindConfig(value = "application")
public class Service {

    @InjectConfig
    private int port;

    @InjectConfig
    private String url;

    @InjectConfig
    private Optional timeout;

    @InjectConfig("services")
    private ServiceConfiguration services;
}

You must install the modules ConfigurationModule as

public class GuiceModule extends AbstractModule {
    @Override
    protected void configure() {
        install(ConfigurationModule.create());
        requestInjection(Service.class);
    }
}