Question

我有以下课程：

package test

import org.apache.log4j.Logger;

import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;


@Path("/test")
public class test {

    private static Logger logger = Logger.getLogger(test.class);



    @GET
    public Response getMsg() {
    logger.info("Inside getMsg()");

    String output = "hello world";

    return Response.status(200).entity(output).build();

    }

     @GET
     @Path("/get")
     @Produces(MediaType.APPLICATION_JSON)
     public Track getTrackInJSON() {

         Track track = new Track();
         track.setTitle("Enter Sandman");
         track.setSinger("Metallica");

         return track;
     }

    @POST
    @Path("/post")
    @Consumes(MediaType.APPLICATION_JSON)

    public Response createTrackInJSON(Track track) {
        String result = "Track saved : " + track;
        return Response.status(201).entity(result).build();

    }
        }

Track只是另一个类的对象

我的POM中有以下依赖项：

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-server</artifactId>
    <version>1.8</version>
</dependency>

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-client</artifactId>
    <version>1.8</version>
</dependency>

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-json</artifactId>
    <version>1.17.1</version>
</dependency>

这是我的servlet映射

<servlet-mapping>
    <servlet-name>jersey-serlvet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

每次我使用

BASEURL / rest / test - ＆gt;正确的回应（Hello world）

BASEURL / rest / test / get - ＆gt;类型：GET

回复：<html><head><title>Apache Tomcat/7.0.42 - Error report</title></head><body><h1>HTTP Status 500 - Internal Server Error</h1><HR size="1" noshade="noshade"><p><b>type</b> Status report</p><p><b>message</b> <u>Internal Server Error</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.42</h3></body></html>

同样在tomcat执行中我可以看到错误：

2014年1月27日下午1:41:28

com.sun.jersey.spi.container.ContainerResponse logException
SEVERE: Mapped exception to response: 500 (Internal Server Error)
javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class com.myProj.jsp.rest.Track, and Java type class com.gsipartners.apimgmtut
        at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:285)
        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1437)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
        at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
        at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
        at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
        at java.lang.Thread.run(Thread.java:662)
Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class com.myProj.jsp.rest.Track, and Java type class com.myProj.jsp.rest.Track, and MIM
        ... 24 more

我不知道为什么这不起作用

Answer 1

看起来在回复中写回Track java对象时遇到了问题。

您的POM中似乎没有Moxy。你的类路径中是否有某种形式的JSON Marshaller？

看看这个：https://jersey.java.net/documentation/latest/media.html#json.moxy

泽西@Consumes @Produces不被服务器接受，

1 个答案: