Not converting JSON to Java Object?

Question

Java

Hello.
The problem is, I'm sending JSON through the REST client and, in theory, in my code it should be automatically converted to a Java Object, but this does not happen, it gives out "415 Unsupported Media Type".
controller code: I tried to insert Content-Type into the header without a header. Tried writing produces = MediaType.APPLICATION_JSON_VALUE.

@RequestMapping(value = "/add", method = RequestMethod.POST,
                    headers = "Accept=application/json")
    @ResponseBody
    public User addUser(@RequestBody final User user) throws Exception {
        System.out.println("addUser: "+user);

      return null;
    }

user class code:

public class User implements Serializable {
    private Integer id;
    private String name;
    private String lastName;
    private String middleName;
    private Integer type;
    private String login;
    private String password;
//+ геттеры, сеттеры и констр. по умолчанию

web.xml

<web-app version="2.4"
  xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
  http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

  <display-name>Spring MVC Application</display-name>

    <servlet>
    <servlet-name>mvc-dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>mvc-dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

mvc-dispatcher-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="testservice"/>
    <mvc:annotation-driven />
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>   
</beans>

JSON:

{
"id" : 1,
"name" : "Ivan",
"lastName" : "Ivanov",
"middleName" : "Ivanovich",
"type" : 0,
"login" : "login",
"password" : "password"
}

Answer 1

Are you okay with types? Java is a strongly typed language and you cannot cast variables of one type to another.

Answer 2

Try to add to the addUser method
and headers are not needed there

Answer 3

c Content-Type: application/json in the header, everything went well. (Without it: 415 and Content type 'application/octet-stream' not supported). Posted by Fiddler