BaseEntity.java

/**
 * <p> Root entity for object persistence via JPA.</p>
 *
 * @author Ehab Qadah
 */
@MappedSuperclass
public abstract class BaseEntity {

	@Id
	@GeneratedValue(generator = "custom-generator", 
			strategy = GenerationType.IDENTITY)
	@GenericGenerator(
			name = "custom-generator",
			strategy = "com.qadah.demo.data.model.id.generator.BaseIdentifierGenerator")
	protected String id;

	@CreationTimestamp
	@Column(name = "created_at", updatable = false, nullable = false)
	protected Instant createdAt;

	@UpdateTimestamp
	@Column(name = "modified_at")
	protected Instant modifiedAt;

	@Column
	@Version
	protected int version;
	
	// standard setters and getters
}