I may be misunderstanding what you want but this looks more like a question on how to structure a java program - don't you simply need ensure that thread T1 rendezvous' with the asynchronous thread T2 before trying to resume the transaction in thread T1.

Hi Galder, thanks for the question. Please can you expand on "However, I'm having trouble resuming back the transaction in the thread that suspended it after the CompletableFuture completes."?

While trying to replicate the issue I came up with the following which works and is pretty much as you have it but I didn't know what R return = means so I had to guess sorry

    private Transaction suspendedTx;

 

 

    @Test

    public void test() throws Exception

    {

        javax.transaction.TransactionManager transactionManager = com.arjuna.ats.jta.TransactionManager.transactionManager();

        transactionManager.begin();

        suspendedTx = transactionManager.suspend();

        System.out.println("Suspended main");

        CompletableFuture<Integer> completableFuture = CompletableFuture.supplyAsync(() -> {

            try {

                transactionManager.resume(suspendedTx);

                System.out.println("Resumed");

            } catch (Exception e) {

                e.printStackTrace();

            }

            try {

                Thread.sleep(2000);

            } catch (Exception e) {

                e.printStackTrace();

            }

            try {

                suspendedTx = transactionManager.suspend();

                System.out.println("Suspended");

            } catch (Exception e) {

                e.printStackTrace();

            }

            return 100;

        });

        completableFuture.get();

        transactionManager.resume(suspendedTx);

        System.out.println("Resumed main");

        transactionManager.commit();

    }

It took a minute or two because I wasn't calling transactionManager.begin() - I wonder if you have made a similar mistake or whether I misunderstood your problem?

Hi Galder,

I have marked my answer as correct - please do let me know if it didn't address your question.

Many thanks for your interest in Narayana,

Tom