JPA adding insert for manyToMany table - mysql

Question

I have got two entity. Employee and Project
import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.annotation.JsonManagedReference;
import jakarta.persistence.*;
import lombok.*;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
#Entity
#Table(name = "EMPLOYEE_DB")
#Setter
#Getter
#AllArgsConstructor
#NoArgsConstructor
public class Employee {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int emp_id;
private String name;
private String email;
private String phone;
#ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
#JoinTable(name = "EMP_PRO_DB", joinColumns = {
#JoinColumn(name = "empId", referencedColumnName = "emp_id")
},
inverseJoinColumns = {
#JoinColumn(name = "proId", referencedColumnName = "pro_id")
}
)
// #JsonManagedReference
private Set<Project> projects;
}
and
import com.fasterxml.jackson.annotation.JsonBackReference;
import jakarta.persistence.*;
import lombok.*;
import java.util.Set;
#Entity
#Table(name = "PROJECT_DB")
#Setter
#Getter
#AllArgsConstructor
#NoArgsConstructor
public class Project {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int pro_id;
private String projectName;
private String projectType;
#ManyToMany(mappedBy = "projects", fetch = FetchType.LAZY)
#JsonBackReference
private Set<Employee> employees;
}
So there were three tables created:
employee_db
project_db
emp_pro_db
I have a EmployeeRepo and ProjectRepo. I can add data to both employee_db and project_db.
Now I would like to assignProject.
I have tried using workbench to insert: INSERT INTO emp_pro_db (emp_id, pro_id) VALUES (1, 6);
Which is working.
How do I use Jpa to do that?