从请求中获取JSON数据，并使用Java Jersey和Jackson编写JSON响应

Question

I'm a beginner trying to learn about RESTful API in Java. I have created a Dynamic Web project in Eclipse and tried to receive JSON data in request.

@Path("/test")
public class TestAPI {
    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public String sayHello(User user) {
        String name = user.getName();
        return name;
    }
}


@XmlRootElement(name = "user")
@XmlAccessorType(XmlAccessType.FIELD)
class User{
    private String name;
    public User() {}
    @XmlElement
    public void setName(String s) {
        this.name = s;
    }

    public String getName() {
        return name;
    }
    public String toString(){
          return "{\"name\": "+name+"}";
       }
}

In this code, I have tried to create a class User which only have one attribute name. I'm trying to send the name as JSON in request and retrieve the name from JSON.

HTTP Status 500 - javax.ws.rs.ProcessingException: Error deserializing object from entity stream error. Can anyone tell me what's wrong with my code?

Thanks in advance.

Edit: Import section is

import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

Answer 1

Try removing all the xml tags from your POJO and run.

Like this:

class User{
    private String name;
    public void setName(String s) {
        this.name = s;
    }

    public String getName() {
        return name;
    }
    public String toString(){
          return "{\"name\": "+name+"}";
       }
}

Request JSON:

{"name" : "Your Name"}

Hope it helps.