Question

is it possible to declare an entity property so that it is reset to some default value, but only if the server hosting the ejb.jar is restarted?

the properties are used to to reflect the state of some connected clients that will be disconnected on restart.

Perhaps i should aprouch this problem with a different solution, but think the question is still valid.

Answer 1

I went with @Singleton and @Startup annotated EJB, tests seem to work

@Singleton
@Startup
public class ClientResetBean {

    // Injected database connection:
    @PersistenceContext private EntityManager em;


    @PostConstruct
    private void resetClientState() {
        Query query = em.createQuery("UPDATE Client c SET c.online = false");
        query.executeUpdate();
    }
}