Do self referencing entities need @OneToOne JPA annotations or not?
Imagine an Entity A has a non-mandatory one-to-one relationship with itself, say something like the diagram below.
Do I write sourceTransaction and destinationTransaction as: public DepositAccountTransaction sourceTransaction; public DepositAccountTransaction destinationTransaction; without any annotations?
Solution 1:
No you always will need the annotation. If it is optional:
@OneToOne(optional = true)
private DepositAccountTransaction destinationTransaction;
I wouldn't declare any property as public btw. You may want to use projectlombok to generate getters and setters.