Spring data jpa事件:如何仅在特定字段发生更改时才创建事件？

import org.springframework.data.jpa.domain.support.AuditingEntityListener;
import javax.persistence.*;

@Entity
@EntityListeners(MyEntityListener.class)
public class MyEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    private String field1;
    private String field2;
    
    // getter and setter
}

public class MyEntityListener extends AuditingEntityListener {
    @PreUpdate
    public void beforeUpdate(MyEntity entity) {
        if (!entity.getField1().equals(entity.getField2())) {
            // 创建事件的逻辑
        }
    }
}