JPA: locking when performing an indirect insertion

Question

I am writing a piece of software that tracks medication usage. I am using JPA to interact with the database. My model consists of two entities: a Prescription a

Answer 1

It Seems right.

However, I'll suggest to test it first... the more simple way to do this, is through debugging ... using your preferred IDE, set a debug point after the sentence:

entityMgr.lock(p, LockModeType.OPTIMISTIC_FORCE_INCREMENT);

Later, try to invoke your addDose(prescriptionId) from two different clients, supplying the same prescriptionID ... and let one client finish first and see what happen with the another one.