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javadependency-injectionguiceguice-servlet

How to get TypeLiteral binding or can say instance from injector [Google Guice]

I have Dao<T> interface which is implemented by BaseDao<T> class & BaseDao<T> later extended by many of subclass like UserDao class.

interface Dao<T>{}

abstract class BaseDao<T> implements Dao<T>{}

class UserDao extends BaseDao<User>{}

Following is the guice binding

bind(new TypeLiteral<Dao<User>>() {
        }).annotatedWith(Names.named("UserDao")).toProvider(UserDaoProvider.class);

Provider looks like..

public class UserDaoProvider implements Provider<UserDao> {

    @Override
    public UserDao get() {
        return new UserDao();
    }

}

Now i am trying to get it from guice injector

injector.getInstance(Key.get(new TypeLiteral<Dao<User>>() {
                }, Names.named("UserDao")));

But i am getting null

Please help to resolve the issue.

Solution

  • We can get instance of UserDao as follows

    injector.getInstance(UserDao.class);