Hi

I migrated a running app from the old JBoss Community 6 version to the latest wildfly version.

We face a problem for which I don't have an explanation. In say 10 commits, 1 commit hides a list. More specific, before the commit, the list contains elements, after the commit the list is empty. This happens just periodically.

  @Override
    public List<U> batchAll(final List<T> listT) {
        List<U> resultList = null;
        try {
            if (listT.size() == 1) {
                resultList = new LinkedList<U>();
                resultList.add(batchSingle(listT.get(0)));
            } else {
                getUserTransaction().begin();
                resultList = processAll(listT);
                getUserTransaction().commit(); // HERE IS THE COMMIT, resultList IS EMPTY FROM TIME TO TIME
                postProcess(listT, resultList);
            }
        } catch (Exception ex) { // NOSONAR we have to catch everything here
            rollback();
            handleBatchException(listT, ex);
            resultList = new LinkedList<U>();
            for (T t : listT) {
                resultList.add(batchSingle(t));
            }
        }
        return resultList;
    }

The fun part is, everything is persisted. I tried to migrate this specific code to Container Managed Transactions but I got the same. May this is not related, we had to increase the thread-pool size since the app uses timers a lot.

Any idea what is wrong with this code?