The role column does not appear in the Postgresql table - spring-boot

Question

I'm new to spring boot and jpa and have created this entity called user which has #OneToMany mapping to another table that is role. When I boot the project, every column appears except role. I do not understand what I'm doing wrong here. My role entity looks like this -
Role
package com.userservice.usermanagement.models;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
#Entity
#Table(name = "roles")
public class Role2 {
/**
* Model for role with all the attributes
*/
#Id
#GeneratedValue
#Column(name = "role_id", nullable = false, length = 1024)
private int role_id;
#Column(name = "name", nullable = false, length = 1024)
private String name;
public Role2() {
}
public int getRole_id() {
return role_id;
}
public void setRole_id(int role_id) {
this.role_id = role_id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
And User
package com.userservice.usermanagement.models;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.CollectionTable;
import javax.persistence.Column;
import javax.persistence.Convert;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.OneToMany;
import javax.persistence.Table;
#Entity
#Table(name = "users")
public class User2 {
/**
* User model
*/
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id", nullable = false, length = 1024)
private int id;
#Column(name = "username", nullable = false, length = 1024)
private String username;
#Column(name = "email", nullable = false, length = 1024)
private String email;
#Column(name = "password", nullable = false, length = 1024)
private String password;
#Column(name = "customername", nullable = false, length = 1024)
private String customername;
#Column(name = "customerid", nullable = false, length = 1024)
private String customerid;
#Column(name = "description", nullable = false, length = 1024)
private String description;
#OneToMany(cascade = CascadeType.ALL, fetch=FetchType.EAGER)
#JoinTable(name="user_role", joinColumns=#JoinColumn(name="id"), inverseJoinColumns=#JoinColumn(name="role_id"))
private Set<Role2> roles = new HashSet<>();;
public User2() {
}
public User2(String username, String email, String customername,String customerid,String description, String password) {
this.username = username;
this.email = email;
this.customername = customername;
this.customerid = customerid;
this.description = description;
this.password = password;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getCustomername() {
return customername;
}
public void setCustomername(String customername) {
this.customername = customername;
}
public String getCustomerid() {
return customerid;
}
public void setCustomerid(String customerid) {
this.customerid = customerid;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Set<Role2> getRoles() {
return roles;
}
public void setRoles(Set<Role2> roles) {
this.roles = roles;
}
}
In user if I use jointable and post data, everything else shows up but user_role and roles is empty. If I remove jointable to have the column in the User table itself, the role column is missing from user table. Can someone point me in the right direction.

Answer 1

You need to remove
#JoinTable(name="user_role", joinColumns=#JoinColumn(name="id"),
inverseJoinColumns=#JoinColumn(name="role_id"))
because it's for ManyToMany relationship and instead just put:
#JoinColumn(name="user_id")
With this you going to have a user_id field in Role table, and it's going to work.