How to get old entity value in @HandleBeforeSave event to determine if a property is changed or not?

Question

I\'m trying to get the old entity in a @HandleBeforeSave event.

@Component
@RepositoryEventHandler(Customer.class)
public class CustomerEventHan         


        

Answer 1

I had exactly this need and resolved adding a transient field to the entity to keep the old value, and modifying the setter method to store the previous value in the transient field.

Since json deserializing uses setter methods to map rest data to the entity, in the RepositoryEventHandler I will check the transient field to track changes.

@Column(name="STATUS")
private FundStatus status;
@JsonIgnore
private transient FundStatus oldStatus;

public FundStatus getStatus() {
    return status;
}
public FundStatus getOldStatus() {
    return this.oldStatus;
}
public void setStatus(FundStatus status) {
    this.oldStatus = this.status;
    this.status = status;
}

from application logs:

2017-11-23 10:17:56,715 CompartmentRepositoryEventHandler - beforeSave begin
CompartmentEntity [status=ACTIVE, oldStatus=CREATED]