(java.lang.NullPointerException) on CRUD operation Java Jersey

Question

I'm trying to update the users table using the update operation but it somehow sends me this error in the log and doesn't let me put JSON format in it.

java.lang.NullPointerException: Cannot invoke "com.common.db.domain.Student.getId()" because "student" is nulldata insert unsuccessful

And in Postman it looks like this:

How do I need to change the code to remove the null pointer exception here is my other code:

My StudentResource

  @Path("/updatestudent")
    @PUT
    @Consumes(MediaType.APPLICATION_JSON)
    public Student updateStudent(Student student)
    {

             return  studentService.updateStudent(student);

    }

My StudentService

public Student updateStudent(Student student) {


        String insert = "update users set username=?, password=?, fullname=?,email=? where user_id=?";
        Connection connection = null;

        try{
            connection = new MysqlDbConnectionService().getConnection();
            PreparedStatement ps= connection.prepareStatement(insert);
            ps.setString(1,student.getId());
            ps.setString(2,student.getUsername());
            ps.setString(3,student.getPassword());
            ps.setString(4,student.getFullName());
            ps.setString(5,student.getEmail());

            ps.executeUpdate();
        }catch(Exception e)
        {
            System.out.println(e + "data insert unsuccessful");
        }

        return student;
    }

Student Model:

package com.common.db.domain;


import com.google.gson.annotations.SerializedName;

public class Student {


    @SerializedName("id")
    private String id;

    @SerializedName("username")
    private String username;

    @SerializedName("password")
    private String password;

    @SerializedName("fullname")
    private String fullName;

    @SerializedName("email")
    private String email;


    public Student()
    {

    }

    public Student(String id, String username, String password, String fullName, String email)
    {
        super();
        this.id=id;
        this.username = username;
        this.password = password;
        this.fullName = fullName;
        this.email = email;
    }


    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getFullName() {
        return fullName;
    }

    public void setFullName(String fullName) {
        this.fullName = fullName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}

Is the problem here in the code or am I missing something different.

(java.lang.NullPointerException) on CRUD operation Java Jersey

0 Answers0