How to pass data to following rest api class using Postman? - spring

Question

Basically I am not understanding that how to send data rest-api class using Postman ?
When I use Postman to run rest-api to save record it gives me errors like application json format not supported..
I have following class to represent Many to Many relation
package com.ps.usercourse;
import java.io.Serializable;
import java.util.Objects;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import javax.persistence.MapsId;
import com.fasterxml.jackson.annotation.JsonBackReference;
import com.ps.course.Course;
import com.ps.user.User;
#Entity
public class UserCourse implements Serializable
{
private static final long serialVersionUID = 46419863112677606L;
#EmbeddedId
private UserCourseId id;
#ManyToOne
#MapsId("emailId")
#JsonBackReference
User user;
#ManyToOne
#MapsId("courseId")
#JsonBackReference
Course course;
Boolean isActive = true;
public UserCourse() {
}
public UserCourse(User user, Course course, Boolean isActive) {
this.user = user;
this.course = course;
this.isActive = isActive;
}
public UserCourse(UserCourseId id, User user, Course course, Boolean isActive) {
this.id = id;
this.user = user;
this.course = course;
this.isActive = isActive;
}
public UserCourseId getId() {
return id;
}
public void setId(UserCourseId id) {
this.id = id;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public Course getCourse() {
return course;
}
public void setCourse(Course course) {
this.course = course;
}
public Boolean getIsActive() {
return isActive;
}
public void setIsActive(Boolean isActive) {
this.isActive = isActive;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass())
return false;
UserCourse that = (UserCourse) o;
return Objects.equals(user, that.user) &&
Objects.equals(course, that.course);
}
#Override
public int hashCode() {
return Objects.hash(user, course);
}
}
This is rest api that I am trying to call through Postman
#RequestMapping(value="/UserCourse",method=RequestMethod.POST)
#ResponseBody
public UserCourse addUser(#RequestBody UserCourse userCourse, HttpServletRequest req, HttpServletResponse res)
{
return userCourseService.save(userCourse);
}