import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.Version;

/**
 * @description
 */
@MappedSuperclass
public class BaseEntity {

    @Id
    @GeneratedValue
    private Long id;

    @Version
    private Integer version;

    //Getters and setters omitted for brevity
}

@Data
@Entity(name = "Post")
@Table(name = "good_posts")
public class Post extends BaseEntity {

    private String title;

    @OneToMany(
            mappedBy = "post",
            cascade = CascadeType.ALL,
            orphanRemoval = true
    )
    private List<Comment> comments = new ArrayList();


    @OneToOne(
            mappedBy = "post",
            cascade = CascadeType.ALL,
            orphanRemoval = true,
            fetch = FetchType.LAZY
    )
    private PostDetails details;

    @ManyToMany
    @JoinTable(
            name = "good_posts_tags",
            joinColumns = @JoinColumn(name = "post_id"),
            inverseJoinColumns = @JoinColumn(name = "tag_id")
    )
    private Set<Tag> tags = new HashSet();


    public void addComment(Comment comment) {
        comments.add(comment);
        comment.setPost(this);
    }

    public void addDetails(PostDetails details) {
        this.details = details;
        details.setPost(this);
    }

    public void removeDetails() {
        this.details.setPost(null);
        this.details = null;
    }
}

import lombok.Data;

import javax.persistence.*;
import java.util.Date;

/**
 * @description
 */
@Data
@Entity(name = "PostDetails")
@Table(name = "good_post_details")
public class PostDetails extends BaseEntity {

    @Column(name = "created_on")
    private Date createdOn;

    @Column(name = "created_by")
    private String createdBy;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private Post post;

}

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

/**
 * @description
 */
@Data
@Entity(name = "PostComment")
@Table(name = "good_comments")
public class Comment extends BaseEntity {

    @ManyToOne(fetch = FetchType.LAZY)
    private Post post;

    private String review;

    //Getters and setters omitted for brevity
}

import lombok.Data;
import org.hibernate.annotations.NaturalId;

import javax.persistence.Entity;
import javax.persistence.Table;

/**
 * @description
 */
@Data
@Entity(name = "Tag")
@Table(name = "good_tags")
public class Tag extends BaseEntity {

    @NaturalId
    private String name;

    //Getters and setters omitted for brevity
}

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
             http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
             version="2.1">

    <persistence-unit name="PERSISTENCE1">
        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>


        <properties>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/test" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="root" />
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.hbm2ddl.auto" value="update" />




        </properties>

    </persistence-unit>

</persistence>

@SpringBootApplication(exclude = SecurityAutoConfiguration.class)
public class Demo11Application implements CommandLineRunner {

	public static void main(String[] args) {

        EntityManagerFactory factory =
                Persistence.createEntityManagerFactory("PERSISTENCE1");
        EntityManager em = factory.createEntityManager();


        em.getTransaction().begin();



        // do whatever you want
        Tag t1 = new Tag();
        t1.setName("JDBC");
        em.persist(t1);

        Tag t2 = new Tag();
        t2.setName("Hibernate");
        em.persist(t2);



        em.getTransaction().commit();
        em.close();

	}

 
}

INSERT INTO tag (version, name)
VALUES (0, 'JDBC')
 
INSERT INTO tag (version, name)
VALUES (0, 'Hibernate')