CODEWITHSUNDEEP
javaspringhibernate
Ben
Ben

Reputation: 62356

Populating a "created" column in a spring data entity

@javax.persistence.Column(name = "created", nullable = false, insertable = true, updatable = true, length = 19, precision = 0)
@Basic
public Timestamp getCreated() {
    return created;
}

public void setCreated(Timestamp created) {
    this.created = created;
}

I have this entity and I would like for MySQL to provide the created timestamp. I've tried adding @GeneratedValue and nullable = true and it still fails when saving saying the value cannot be null.

I understand my entity is passing null because that's the default value so MySQL is throwing an error because I'm trying to pass null and it's not set as a NULl field.

However, is it possible for me to work around this on a java object level? Say, not submit the created column when the entity is saved?

Upvotes: 1

Views: 291

Answers (1)

Perception
Perception

Reputation: 80593

Use a @PrePersist handler to initialize the field. The initialization will be done prior to the entity being saved, thus avoiding the null pointer exception.

@PrePersist
protected void beforeCreate() {
    if(created == null)
        created = new Timestamp(System.currentTimeMillis());
}

Upvotes: 2

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