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javajakarta-eetransactionsejb

Java EE EJB as Runnable executor

Is this code copmliant to Java EE spec and can be used?

@Stateless
public class SomeBean {

    @Inject
    protected TransactedRunner txRunner;


    public void someFunc() {

        txRuner.run(new Runnable(){
            Connection c = ds.getConnection();
            //do jdbc stuff or jpa stuff
            //close everything etc.
        });
    }
}

@Stateless
public class TransactedRunner {

    @TransactionAttribute(REQUIRES_NEW)
    public void run(Runnable r) {
        r.run();
    }
}

In this case a new transaction should be started and every thing that will be done in runnable will be transacted. Is that right? Or there is some trick in which I should suffer from EE?

Solution

  • This should work as intended. But be aware, that multiple calls of txRunner.run during one service call might lead to inconsistent data if anything happens between or during those calls, like connection-timeout, transaction-timeout, or the node dies or something. And the calling transaction (if there is any) might not see the changes done during the call until it itself has been committed.