@Inject CDI无法与JAX-RS一起使用

Question

I'm trying to create a simple REST service with JAX-RS (Jersey), without using Spring. I want to have the typical structure of: Resource, that use a Service (typical interface with method findById , findAll...), and that Service injected in the Resource.

It seems that CDI automatically scans beans and injects them (having a empty beans.xml in the project) but... it doesn't work for me.

This is my Resource class:

@Path("users")
@ManagedBean
public class UserController {

    @Inject
    private UserService userService;

    @GET()
    @Path("/{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public User getUserById(@PathParam("id") Long id) {

        return userService.findById(id);
    }
}

And this is my Service and its impl class (it´sa mock...):

public interface UserService {

    User findById(Long id);

    List<User> findAll();

    User save(User user);

    User update(User user);

    void delete(Long id);
}

public class UserServiceMock implements UserService {

    // omitted constants

    @Override
    public User findById(Long id) {
        return new User()
                .setId(id)
                .setName(NAME_GANDALF)
                .setPhone(PHONE_666554433)
                .setType(TYPE_1)
                .setBirthDate(LocalDate.parse(STRING_DATE_19110102));
    }

    @Override
    public List<User> findAll() {
        return Arrays.asList(
                new User()
                        .setId(USER_ID_12)
                        .setName(NAME_GANDALF)
                        .setPhone(PHONE_666554433)
                        .setType(TYPE_1)
                        .setBirthDate(LocalDate.parse(STRING_DATE_19110102)),
                new User()
                        .setId(USER_ID_140)
                        .setName(NAME_ARAGORN)
                        .setPhone(PHONE_661534411)
                        .setType(TYPE_1)
                        .setBirthDate(LocalDate.parse(STRING_DATE_19230716)),
                new User()
                        .setId(USER_ID_453321)
                        .setName(NAME_FRODO)
                        .setPhone(PHONE_666222211)
                        .setType(TYPE_2)
                        .setBirthDate(LocalDate.parse(STRING_DATE_19511124))
        );
    }

    @Override
    public User save(User user) {
        return user.setId(USER_ID_453321);
    }

    @Override
    public User update(User user) {
        return user;
    }

    @Override
    public void delete(Long id) {
        // delete user by id
    }
}

And I'm using a "no web.xml" configuration, with this class:

@ApplicationPath("api")
public class RestApplication extends ResourceConfig {

}

The only workaround I found is to "register" the service in the RestApplication class:

@ApplicationPath("api")
public class RestApplication extends ResourceConfig {

    public RestApplication() {
        register(UserController.class);

        register(new AbstractBinder() {
            @Override
            protected void configure() {
                bind(new UserServiceMock()).to(UserService.class);
            }
        });
    }
}

Is there another solution to this problem? I'd rather not to register all my services and other stuff in this class manually... I tried with annotations like @Default , @Qualifier and more (in the service), and no one works...

Answer 1

Tomcat is a servlet container only. It's not a full Java EE enterprise stack, nor does it contain a CDI container. Apache TomEE , on the other hand, is Tomcat with EE capabilities.

Bauke Scholtz, the infamous BalusC, wrote an excellent blog on installing CDI on Tomcat . This might help you. Otherwise, an alternative approach will be to install Apache TomEE and run your application from there. After all, it's still Tomcat anyway.