I'am trying to Inject generic type with Guice. I have Repository< T > which is located in the Cursor class.
public class Cursor<T> {
@Inject
protected Repository<T> repository;
So when I create Cursor< User >, I also want the Guice to inject my repository to Repository< User >. Is there a way to do this?
You have to use a TypeLiteral
:
import com.google.inject.AbstractModule;
import com.google.inject.TypeLiteral;
public class MyModule extends AbstractModule {
@Override
protected void configure() {
bind(new TypeLiteral<Repository<User>>() {}).to(UserRepository.class);
}
}
To get an instance of Cursor<T>
, an Injector
is required:
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
public class Main {
public static void main(String[] args) {
Injector injector = Guice.createInjector(new MyModule());
Cursor<User> instance =
injector.getInstance(Key.get(new TypeLiteral<Cursor<User>>() {}));
System.err.println(instance.repository);
}
}
More details in the FAQ.