无法在JAX-RS服务中注入@ApplicationScoped bean

Question

我已经创建了JAX-RS服务,我想在其中注入一个应用程序范围的bean.问题是没有注入豆子.这是怎么造成的,我该如何解决？

JAX-RS服务:

@Path("room")
public class RoomService {

    @Inject
    GameController gc;

    public RoomService() {}

    @Path("create")
    @GET
    @Produces("application/json")
    public String create() {
        Room r = new Room();
        gc.addRoom(r); // gc is null
        return r.toJson();
    }
}

应用程序作用域bean

import java.util.ArrayList;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Named;
import pepuch.multuplayergameserver.entity.Game;
import pepuch.multuplayergameserver.entity.Room;

@Named
@ApplicationScoped
public class GameController {

    private Game game;

    public GameController() {
        this.game = new Game(new ArrayList<Room>());
    }

    public boolean addRoom(Room room) {
        if (!game.getRooms().contains(room)) {
            return game.getRooms().add(room);
        }

        return false;
    }

}

Answer 1

您需要将bean设置为托管资源,以使其符合注入条件.至少,添加@RequestScoped到JAX-RS SIB以使其注入价值.

另一种替代注释是@ManagedBean.关键是,如果父bean不在托管上下文中,Jersey将无法解决所需的注入目标

import javax.enterprise.context.RequestScoped

@RequestScoped
@Path("room")
public class RoomService {

    @Inject
    GameController gc;

    public RoomService() {}

    @Path("create")
    @GET
    @Produces("application/json")
    public String create() {
        Room r = new Room();
        gc.addRoom(r); // gc is null
        return r.toJson();
    }
}

编辑:确保在WEB-INF文件夹中有一个beans.xml文件.您的beans.xml文件将类似于:

  <beans xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">   

  </beans>

编辑:基于此JIRA,您可以替换@RequestScoped为@ManagedBean