TwitterClient.java

@ApplicationScoped
public class TwitterClient implements Serializable {

    @Inject Twitter twitter;
    private List<User> users;
    private List<Status> statuses;
    private QueryResult search;

    public void loadTweets() throws TwitterException {
        statuses = twitter.getFriendsTimeline();
    }

    public void loadFriends() throws TwitterException {
        IDs followersIDs = twitter.getFollowersIDs(-1);
        users = twitter.lookupUsers(followersIDs.getIDs());
    }

    public void loadSearch() throws TwitterException {
        Query query = new Query("#BreizhJUG");
        search = twitter.search(query);
    }

    // getters
}

welcome_controller.rb

class WelcomeController < ActionController::Base
  protect_from_forgery
  include TorqueBox::Injectors
  include_class "com.foo.bar.TwitterClient"

  def index
    @rails_msg = "Hello from Rails!"
  end

  def followers
    twitter = inject(com.foo.bar.TwitterClient)
    @twitter_followers = twitter.get_users
  end

  def search
    twitter = inject(com.foo.bar.TwitterClient)
    @twitter_search = twitter.get_search
  end

  def tweets
    twitter = inject(com.foo.bar.TwitterClient)
    @twitter_tweets = twitter.get_statuses
  end
end