Question

我正在尝试构建一个GWT应用程序，该应用程序使用JPA，Hibernate和MySQL与使用Spring Boot构建的现有REST服务进行通信。其中我有两个实体：开发人员和团队。和他们之间的双向OneToMany关系。现在我想创建一个开发人员并将他/她分配给现有的团队。所以我通过GET请求拉出一个团队。它将通过设置的所有参数进行检索。我将它分配给一个新的Developer对象。它仍保留所有参数。但是当我在POST请求中发送它时，团队的ID会丢失，因此Hibernate会创建一个Team实体的新实例。我在哪里做错了？

我看过这篇文章Child's id not present after cascade persisting the parent，但我看不出我怎么能做同样的事......

GWT实体：

开发

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    final FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            fab.hide();
            Snackbar.make(view, "blah", Snackbar.LENGTH_SHORT).show();
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() { fab.show(); }
            }, 3000);
        }
    });
}

团队

import java.util.List;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

public class Developer {

    private final Integer id;
    private final String name;
    private final Team team;

    @JsonCreator
    public Developer(@JsonProperty("id")Integer id, @JsonProperty("name")String name, @JsonProperty("team")Team team){
        this.id=id;
        this.name=name;
        this.team = team;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public Team getTeam() {
        return team;
    }

}

服务：

TeamService

import java.util.List;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

public class Team {

    private final Integer id;
    private final String name;
    private final List<Developer> developers;
    private final int velocity;

    @JsonCreator
    public Team(@JsonProperty("id")Integer id, @JsonProperty("name")String name, @JsonProperty("velocity")int velocity, @JsonProperty("developers")List<Developer> developers){
        this.id = id;
        this.name=name;
        this.developers = developers;
        this.velocity = velocity;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public List<Developer> getDevelopers() {
        return developers;
    }

    public int getVelocity() {
        return velocity;
    }

    @Override
    public String toString() {
        return "Team "+this.getId()+": name="+this.getName()+"; velocity="+this.getVelocity();
    }

}

DeveloperService：

import org.fusesource.restygwt.client.MethodCallback;
import org.fusesource.restygwt.client.RestService;
import gli.shared.Team;
import java.util.List;

import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
/**
 * The client side stub for the RPC service.
 */
@Path("http://localhost:8080/team")
public interface TeamService extends RestService  {

    @GET
    @Path("/{id}")
    void getTeam(@PathParam("id") String id, MethodCallback<Team> team);

    @GET
    void getAllTeams(MethodCallback<List<Team>> teams);

    @GET
    @Path("/random")
    void getRandomTeam(MethodCallback<Team> team);

    @PUT
    @Path("/{id}")
    void updateTeam(@PathParam("id") String id, MethodCallback<String> result);

    @POST
    void addTeam(Team team, MethodCallback<String> result);

    @DELETE
    @Path("/{id}")
    void deleteTeam(@PathParam("id") String id, MethodCallback<String> result);
}

最后是EntryPoint代码：

import org.fusesource.restygwt.client.MethodCallback;
import org.fusesource.restygwt.client.RestService;
import gli.shared.Developer;
import java.util.List;

import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
/**
 * The client side stub for the RPC service.
 */
@Path("http://localhost:8080/developer")
public interface DeveloperService extends RestService {

    @GET
    @Path("/{id}")
    void getDeveloper(@PathParam("id") String id, MethodCallback<Developer> developer);

    @GET
    void getAllDevelopers(MethodCallback<List<Developer>> developers);

    @GET
    @Path("/team/{id}")
    void getDevelopersByTeam( @PathParam("id") int id, MethodCallback<List<Developer>> developers );

    @PUT
    @Path("/{id}")
    void updateDeveloper(@PathParam("id") String id, MethodCallback<String> result);

    @POST
    void addDeveloper(Developer developer, MethodCallback<String> result);

    @DELETE
    @Path("/{id}")
    void deleteDeveloper(@PathParam("id") String id, MethodCallback<String> result);
}

在序列化父级时丢失子级ID

0 个答案: