如何输出xml？

Question

我正在尝试在服务器上输出xml并继续收到此错误。我不知道如何解决它，因为控制台中没有日志。

我曾尝试包括jersey-json依赖项，但它仍然给我同样的错误-“ http 500错误”。

我正在关注youtube上的一些教程。仍然不知道如何解决它。

这是我的pom.xml文件

<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.kalykova</groupId>
<artifactId>demo</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>

<build>
    <finalName>demo</finalName>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.5.1</version>
            <inherited>true</inherited>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey</groupId>
            <artifactId>jersey-bom</artifactId>
            <version>${jersey.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <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.inject</groupId>
        <artifactId>jersey-hk2</artifactId>
    </dependency>
    <!-- uncomment this to get JSON support
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-binding</artifactId>
    </dependency>
    -->
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.3.0</version>
    </dependency>
    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1</version>
    </dependency>
</dependencies>
<properties>
    <jersey.version>2.28</jersey.version>
    <project.build.sourceEncoding>UTF- 
8</project.build.sourceEncoding>
</properties>
</project>

这是外星人课程     包com.kalykova.demo;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Alien {

private int id;
private String name;
private int points;



public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public int getPoints() {
    return points;
}
public void setPoints(int points) {
    this.points = points;
}


}

这是AlienResource类

package com.kalykova.demo;

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

@Path("aliens")
public class AlienResource 
{
@GET
@Produces(MediaType.APPLICATION_XML)
public Alien getAlien() 
{
    System.out.println("getAlien called...");
    Alien a1 = new Alien();
    a1.setId(100);
    a1.setName("Jennifer");
    a1.setPoints(60);

    return a1;
  }
 }

这是我收到的错误：

HTTP状态500 –内部服务器错误 类型状态报告

消息内部服务器错误

说明服务器遇到意外状况，阻止其满足请求。  我需要它来在网页上显示xml。