Mapping calculated properties with JPA

Question

Is there a way to map a calculated property using JPA?

Assuming I have an Invoice object with one or more InvoiceLineItems within it, I wan

Answer 1

I know that I am necro-ing this thread, but maybe it might help somebody out.

If you want to calculate the value on read, the @PostLoad annotation might be what you want:

@Transient
private BigDecimal totalAmount;

@PostLoad
public void onPostLoad() {
    BigDecimal amount = BigDecimal.ZERO;
    for (InvoiceLineItem lineItem : lineItems) {
        amount = amount.add(lineItem.getTotalAmount());
    }
    this.totalAmount = amount;
}