Spring Boot - created_at不能为空。Spring JPA

import javax.persistence.*;
import java.time.LocalDateTime;

@Entity
public class MyEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false, updatable = false)
    private LocalDateTime createdAt;

    @PrePersist
    protected void onCreate() {
        createdAt = LocalDateTime.now();
    }

    // Getters and setters
}

CREATE TABLE my_entity (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.jpa.domain.support.AuditingEntityListener;

import javax.persistence.*;
import java.time.LocalDateTime;

@Entity
@EntityListeners(AuditingEntityListener.class)
public class MyEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @CreatedDate
    @Column(nullable = false, updatable = false)
    private LocalDateTime createdAt;

    // Getters and setters
}

import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;

@Configuration
@EnableJpaAuditing
public class JpaConfig {
}