I'm using Spring Boot 2 and PostGres 10. I have created the following entities, Roles and Privileges,

@Data
@Entity
@Table(name = "Roles")
public class Role {
  
    public enum Name {
        USER,
        ADMIN
    }
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private UUID id;
 
    @Column(unique=true)
    @Enumerated(EnumType.STRING)
    private Name name;
 
    @ManyToMany
    @JoinTable(
        name = "roles_privileges", 
        joinColumns = @JoinColumn(
          name = "role_id", referencedColumnName = "id"), 
        inverseJoinColumns = @JoinColumn(
          name = "privilege_id", referencedColumnName = "id"))
    private Collection<Privilege> privileges;   
}

Privilege is

@Data
@Entity
@Table(name = "Privileges")
public class Privilege {

    public enum PrivilegeName {
        SUPER_ADMIN,
        USER
    }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private UUID id;
    
    @Column(unique=true)
    @Enumerated(EnumType.STRING)
    private PrivilegeName name;
 
    @ManyToMany(mappedBy = "privileges")
    private Collection<Role> roles;
}

Then I have this in my application.properties

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect

spring.jpa.hibernate.ddl-auto=update

spring.jpa.hibernate.show-sql=true

spring.datasource.url=jdbc:postgresql://${PG_DB_HOST:localhost}:5432/${PG_DB_NAME}

spring.datasource.username=${PG_DB_USER}
spring.datasource.password=${PG_DB_PASS}

When my tables are generated, the roles_privileges table is generated like so ...

cardmania=# \d roles_privileges ;
 Table "public.roles_privileges"
    Column    | Type | Modifiers 
--------------+------+-----------
 role_id      | uuid | not null
 privilege_id | uuid | not null
Foreign-key constraints:
    "fk5duhoc7rwt8h06avv41o41cfy" FOREIGN KEY (privilege_id) REFERENCES privileges(id)
    "fk629oqwrudgp5u7tewl07ayugj" FOREIGN KEY (role_id) REFERENCES roles(id)

Are there any other annotations or other Java code I can add so that when my join table is created, the role_id/privilege_id has a unique key generated?