找不到 Media type=application/json 的 MessageBodyWriter [英] MessageBodyWriter not found for media type=application/json

问题描述

我在将 JAX-RS 服务作为 JSON 使用时遇到问题.

I am facing issues while consuming JAX-RS services as JSON.

下面我添加了我的代码.

Below I have added my code.

这是我的服务类:

//Sets the path to base URL + /hello
@Path("/hello") 
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class Hello {

    @GET
    @Produces("application/json")
    public Student getStudent() {

        Student s = new Student();
        s.first_name = "Test First Name !!!";
        s.last_name = "Test Last Name!!!";

        return s;
    }

Student 我试图从服务中获取的类:

Student class which I am trying to get from service:

@XmlRootElement
public class Student implements Serializable {

    public String first_name;
    public String last_name;

    public String getFirst_name() {
        return first_name;
    }

    public void setFirst_name(String first_name) {
        this.first_name = first_name;
    }

    public String getLast_name() {
        return last_name;
    }

    public void setLast_name(String last_name) {
        this.last_name = last_name;
    }

    public Student()
    {
        first_name = "Fahad";
        last_name = "Mullaji";
    }
}

服务端的 Web XML.

Web XML on service side.

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" version="3.0">
    <display-name>com.vogella.jersey.first</display-name>
    <servlet>
        <servlet-name>Jersey REST Service</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <!-- Register resources and providers under com.vogella.jersey.first package. -->
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.vogella.jersey.first</param-value>
        </init-param>
        <init-param>
            <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
            <param-value>true</param-value>
        </init-param>

        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey REST Service</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app> 

我不知道如何解决这个问题.我正在使用 SOAP UI 来测试 JSON 响应，但我想这应该无关紧要.

I don't know how to fix this issue. I am using SOAP UI for testing JSON response but I guess that it should not matter.

我读到的很多地方都需要在下面添加代码.但我不知道在哪里.我没有使用 Maven 进行构建.

Many places I read that I need to add the code below. But I don't know where. I am not using Maven for building.

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-moxy</artifactId>
</dependency>

服务器正在寻找将 Student 对象解析为 JSON 的函数，但无法为其找到函数或 jar 文件.我添加了 jar 的 Genson、Moxy、RESTEasy 和 Jackson，但我认为这就是问题所在.我想我在某处缺少映射.

Server is looking for function to parse Student object to JSON but it is not able to find function or jar file for it. I have added jar of Genson, Moxy, RESTEasy and Jackson but I think that's the problem. I think I am missing mapping somewhere.

推荐答案

我能够通过安装 jersey-media-json-jackson 来修复它

I was able to fix it by install jersey-media-json-jackson

将依赖添加到 pom.xml

Add the dependency to pom.xml

<dependency>
  <groupId>org.glassfish.jersey.media</groupId>
  <artifactId>jersey-media-json-jackson</artifactId>
  <scope>runtime</scope>
</dependency>

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