如何发送JSON对象到Rest Web服务？

Question

I have a rest webservice at http://localhost:8600/rest/student/details which will update the details of student into database. I have to send the details as JSON format in method post.

The below is the method to generate that json message

private void createOrUpdateStudent(WebResource service) {
    Gson gson = new Gson();

    StudentImpl student= new StudentImpl ();

    student.setId(6);
    student.setName("Godwin");
    student.setSex("Male");     

    StudentView view = new StudentView(student);        

    System.out.println("::::::"+service.path("/rest/student").path("/details").type("application/json").post(ClientResponse.class, gson.toJson(view)));
}

where studentView class is as below.

@XmlRootElement(name="clusterZipcode")
public class StudentView {  

    public Integer id;
    public String name;
    public String sex;


   public StudentView() {}

   public StudentView(StudentImpl  student) {
        this.id = student.getId();
        this.name = student.getName();
        this.sex = student.getSex();

   }

while sending like above i am getting an error stating Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'Name' cannot be null

Is i am passing the json values correctly or if there is an alternate method to send the json message please suggest me.

Answer 1

I cannot see on your post where are you doing the call to the database. All I can see is that you are creating a Student and then, from there, creating a view (assuming this method is being called). The error you are getting is related to the fact that, at some point, you are calling the database to enter a new row in (probably) your student Model. If you have got hibernate, can you make sure that you are not calling .save or .update at any point between the call you get for the student and before you call setName?