无法获取get请求的XML响应

我正在尝试使用JAX-RS实现GET请求，以按照

我已经在模型类中包含了@XmlRootElement。即使这样，我还是收到了500内部服务器错误，并且在控制台中没有看到任何错误消息

如果我使用MediaType.APPLICATION_JSON，我会在浏览器上获得get请求的输出，但如果我使用MediaType.APPLICATION_XML，则不会

以下是课程：

package org.dhivyaudayakumar.itmd566.dhivya.resources;

import java.util.List;

import javax.ws.rs.*;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import org.dhivyaudayakumar.itmd566.dhivya.model.Message;
import org.dhivyaudayakumar.itmd566.dhivya.service.MessageService;

@Path("/messages")
public class MessageResource {

    MessageService messageService = new MessageService();

    @GET
    @Produces(MediaType.APPLICATION_XML)
    public List<Message> getMessages() {
        return messageService.getAllMessages();
    }
}

我在pom.xml中有以下依赖项：

        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet-core</artifactId>
            <!-- use the following artifactId if you don't need servlet 2.x compatibility -->
            <!-- artifactId>jersey-container-servlet</artifactId -->
        </dependency>
        <dependency>
          <groupId>org.glassfish.jersey.media</groupId>
          <artifactId>jersey-media-jaxb</artifactId>
        </dependency>
        <!--Below dependency for JSON support-->
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-moxy</artifactId>
        </dependency>

org.glassfish.jersey.containers
jersey容器servlet核心
org.glassfish.jersey.media
泽西媒体jaxb
org.glassfish.jersey.media
泽西媒体公司

根据教程，不需要包含任何xml输出依赖项，但我搜索了internet并添加了jaxb依赖项，但这无助于解决问题。

---

有人能帮我弄清楚吗

您是否检查了控制器是否被调用。现在试着在控制器中记录或打印一些东西，看看你们的流程在哪里工作，若你们得到了某种错误，那个么就为它提供完整的堆栈跟踪。

package org.dhivyaudayakumar.itmd566.dhivya.model;

import java.util.Date;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Message {

    public long id;
    public String message;
    public Date created;
    public String author;

    public Message() {
    }

    public Message(long id, String message, String author) {
        this.id = id;
        this.message = message;
        this.author = author;
        this.created = new Date();
    }

    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
    public Date getCreated() {
        return created;
    }
    public void setCreated(Date created) {
        this.created = created;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
}

        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet-core</artifactId>
            <!-- use the following artifactId if you don't need servlet 2.x compatibility -->
            <!-- artifactId>jersey-container-servlet</artifactId -->
        </dependency>
        <dependency>
          <groupId>org.glassfish.jersey.media</groupId>
          <artifactId>jersey-media-jaxb</artifactId>
        </dependency>
        <!--Below dependency for JSON support-->
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-moxy</artifactId>
        </dependency>