Jersey：com.sun.jersey.spi.inject.Errors $ ErrorMessagesException

Question

我使用球衣（1.8），maven和hibernate時遇到了問題。

我收到此錯誤（“完整”日志）

        INFO: Scanning for root resource and provider classes in the packages:
      de.tum.fml.idp.backend.rest
    Dez 04, 2013 2:29:40 PM com.sun.jersey.api.core.ScanningResourceConfig logClasses
    INFO: Root resource classes found:
      class de.tum.fml.idp.backend.rest.PlayerWebService
      class de.tum.fml.idp.backend.rest.RestSample
    Dez 04, 2013 2:29:40 PM com.sun.jersey.api.core.ScanningResourceConfig init
    INFO: No provider classes found.
    Dez 04, 2013 2:29:41 PM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
    INFO: Initiating Jersey application, version 'Jersey: 1.8 06/24/2011 12:17 PM'
    Dez 04, 2013 2:29:42 PM com.sun.jersey.spi.inject.Errors processErrorMessages
    SEVERE: The following errors and warnings have been detected with resource and/or provider classes:
      SEVERE: Producing media type conflict. The resource methods public java.util.List de.tum.fml.idp.backend.rest.PlayerWebService.getPlayerIDs() and public de.tum.fml.idp.gamelog.backend.beans.Player de.tum.fml.idp.backend.rest.PlayerWebService.createUser() can produce the same media type
      SEVERE: Producing media type conflict. The resource methods public java.util.List de.tum.fml.idp.backend.rest.PlayerWebService.getPlayers() and public de.tum.fml.idp.gamelog.backend.beans.Player de.tum.fml.idp.backend.rest.PlayerWe
bService.createUser() can produce the same media type
    2013-12-04 14:29:42.010:WARN:/0.1-SNAPSHOT:unavailable
    com.sun.jersey.spi.inject.Errors$ErrorMessagesException
        at com.sun.jersey.spi.inject.Errors.processErrorMessages(Errors.java:170)
        at com.sun.jersey.spi.inject.Errors.postProcess(Errors.java:136)
        at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:199)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
        at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
        at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
        at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
        at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
        at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
        at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
        at javax.servlet.GenericServlet.init(GenericServlet.java:241)
        at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:477)
        at org.eclipse.jetty.servlet.ServletHolder.doStart(ServletHolder.java:293)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
        at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:730)
        at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:254)
        at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1240)
        at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:689)
        at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:482)
        at org.eclipse.jetenter code herety.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
        at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:172)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
        at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
        at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
        at org.eclipse.jetty.server.Server.doStart(Server.java:281)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
            at java.lang.reflect.Method.invoke(Method.java:601)
            at org.codehaus.cargo.container.jetty.internal.JettyExecutorThread.run(JettyExecutorThread.java:69)
        2013-12-04 14:29:42.022:INFO:oejw.WebInfConfiguration:Extract jar:file:/C:/Users/Stefan/Dropbox/Studium/TUM/IDP/repo/backend/backend/target/cargo/configurations/jetty7x/cargocpc.war!/ to C:\Users\Stefan\AppData\Local\Temp\jetty-0.0.0.0-8080-cargocpc.war-_cargocpc-any-\webapp
        2013-12-04 14:29:42.052:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/cargocpc,file:/C:/Users/Stefan/AppData/Local/Temp/jetty-0.0.0.0-8080-cargocpc.war-_cargocpc-any-/webapp/},C:\Users\Stefan\Dropbox\Studium\TUM\IDP\repo\backend\backend\target\cargo\configurations\jetty7x\cargocpc.war
        2013-12-04 14:29:42.108:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:8080

這是我用過的代碼：

package de.tum.fml.idp.backend.rest;

import java.util.List;

import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;

import de.tum.fml.idp.backend.rest.interfaces.PlayerManagment;
import de.tum.fml.idp.gamelog.backend.beans.Player;
@Path("/players")
public class PlayerWebService implements PlayerManagment {

    @Override
    @GET
    public Player createUser() {
        // TODO Auto-generated method stub
        return new Player();
    }

    @Override
    @POST
    public Player updatePlayer(Player player) {
        // TODO Auto-generated method stub
        return new Player();
    }

    @Override
    @GET
    @Path("/getPlayer/{param}")
    public Player getPlayer(@PathParam("param") int id) {
        // TODO Auto-generated method stub
        Player bla = new Player();
        bla.setId(-1);
        return bla;
    }

    @Override
    @GET
    public List<Player> getPlayers() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    @GET
    public List<Integer> getPlayerIDs() {
        // TODO Auto-generated method stub
        return null;
    }



}

和Player類。

package de.tum.fml.idp.gamelog.backend.beans;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.xml.bind.annotation.XmlRootElement;

import org.hibernate.annotations.Entity;

//@XmlRootElement
public class Player {

//  @Id 
//  @GeneratedValue
    private int id; 

    private String name;

    private String password;

    Avatar avatar;

    private PlayerProperties properties; 

    private int tempId;

    private int availablePropertyPoints; 

    private int totalPropertyPoints;

//  @OneToMany
    private ArrayList<AchievedAchievment> achievments;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String string) {
        this.name = string;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Avatar getAvatar() {
        return avatar;
    }

    public void setAvatar(Avatar avatar) {
        this.avatar = avatar;
    }

    public PlayerProperties getProperties() {
        return properties;
    }

    public void setProperties(PlayerProperties properties) {
        this.properties = properties;
    }

    public int getTempId() {
        return tempId;
    }

    public void setTempId(int tempId) {
        this.tempId = tempId;
    }

    public int getAvailablePropertyPoints() {
        return availablePropertyPoints;
    }

    public void setAvailablePropertyPoints(int availablePropertyPoints) {
        this.availablePropertyPoints = availablePropertyPoints;
    }

    public int getTotalPropertyPoints() {
        return totalPropertyPoints;
    }

    public void setTotalPropertyPoints(int totalPropertyPoints) {
        this.totalPropertyPoints = totalPropertyPoints;
    }

    public List<AchievedAchievment> getAchievments() {
        if(achievments == null)
            achievments = new ArrayList<AchievedAchievment>();

        return achievments;
    }

    public void setAchievments(ArrayList<AchievedAchievment> achievments) {
        this.achievments = achievments;
    }

    public void addAchievment(AchievedAchievment aa1) {
        if(achievments == null)
            achievments = new ArrayList<AchievedAchievment>();

        if(aa1.getPlayer() != this)
            throw new RuntimeException("Player: Achievment was already given to   another user");
        else 
            achievments.add(aa1);

    }
}

有誰知道為什么這不起作用？ 我已經嘗試過評論幾乎所有的東西，幾個不同的maven依賴，但它不會開始工作。

“玩具示例”工作正常...： - /

我希望你能幫幫我，

KR，

Answer 1

錯誤消息告訴您出了什么問題（您必須查找以SEVERE開頭的行）：

嚴重：產生媒體類型沖突。 資源方法public java.util.List de.tum.fml.idp.backend.rest.PlayerWebService.getPlayerIDs（）和public de.tum.fml.idp.gamelog.backend.beans.Player de.tum.fml.idp .backend.rest.PlayerWebService.createUser（）可以生成相同的媒體類型

嚴重：產生媒體類型沖突。 資源方法public java.util.List de.tum.fml.idp.backend.rest.PlayerWebService.getPlayers（）和public de.tum.fml.idp.gamelog.backend.beans.Player de.tum.fml.idp .backend.rest.PlayerWebService.createUser（）可以生成相同的媒體類型

這意味着您有相同路徑的多個GET端點（在類'annotation @Path("/players") ），產生相同的媒體類型：

@GET
public List<Player> getPlayers()

@GET
public Player createUser()

@GET
public List<Integer> getPlayerIDs()

在向/players發送GET請求時，澤西島無法判斷您要呼叫哪一個。 您需要為其中一些端點定義單獨的路徑。

如果您的意圖實際上是讓它們具有相同的路徑，則需要添加具有不同媒體類型的@Produces注釋，因此Jersey可以根據Accept標頭選擇正確的方法。 如果請求正文請求，您也可以使用@Consumes注釋。 否則，您需要添加@Path注釋或更改方法的請求類型，以避免此沖突。