package com.example.demo.entities;

import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;

import javax.persistence.Column;
import javax.persistence.Embeddable;
import java.io.Serializable;
import java.time.LocalDateTime;

@Embeddable
public class AuditInfo implements Serializable {
    @Column(name = "register_date")
    @CreationTimestamp
    private LocalDateTime registerDate;
    @Column(name = "update_date")
    @UpdateTimestamp
    private LocalDateTime updateDate;

    public LocalDateTime getRegisterDate() {
        return registerDate;
    }

    public void setRegisterDate(LocalDateTime registerDate) {
        this.registerDate = registerDate;
    }

    public LocalDateTime getUpdateDate() {
        return updateDate;
    }

    public void setUpdateDate(LocalDateTime updateDate) {
        this.updateDate = updateDate;
    }
}

package com.example.demo.entities;

import javax.persistence.*;
import java.io.Serializable;

@Entity
@Table(name = "tb_department")
public class Department implements Serializable {

    @Column(name = "id")
    @Id
    private Long id;

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

    @Embedded
    private AuditInfo auditInfo;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public AuditInfo getAuditInfo() {
        return auditInfo;
    }

    public void setAuditInfo(AuditInfo auditInfo) {
        this.auditInfo = auditInfo;
    }
}

Caused by: org.hibernate.cfg.NotYetImplementedException: Still need to wire in composite in-memory value generation
	at org.hibernate.tuple.entity.EntityMetamodel$CompositeGenerationStrategyPairBuilder.buildPair(EntityMetamodel.java:564) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
	at org.hibernate.tuple.entity.EntityMetamodel.buildGenerationStrategyPair(EntityMetamodel.java:415) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
	at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:240) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
	at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:519) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
	at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:124) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]