@Named("userService") public class UserService { // ... } @Named("userDao") @Singleton public class UserDao { // ... } <component> <role>com.example.UserService</role> <role-hint>userService</role-hint> <requirements> <requirement> <role>com.example.UserDao</role> <role-hint>userDao</role-hint> </requirement> </requirements> </component> <component> <role>com.example.UserDao</role> <role-hint>userDao</role-hint> </component> public static void main(String[] args) { DefaultPlexusContainer container = new DefaultPlexusContainer(); UserService userService = container.lookup(UserService.class, "userService"); container.dispose(); }