* Test synchronized 'findOrCreatePublisher' triggered by method 'subscribe'.
* Start 2 threads which call 'subscribe' with same SubscriptionContext.
* Breakpoint at doInSync, second thread must wait until thread 1 has released the breakpoint.
*/
public void testConcurrentFindOrCreatePublisher() {
final SubscriptionContext sc = new SubscriptionContext("Course", new Long(1238778565), "676");
final PublisherData pd = new PublisherData("Forum", "e.g. forumdata=keyofforum", null );
final List<Exception> exceptionHolder = Collections.synchronizedList(new ArrayList<Exception>(1));
final List<Boolean> statusList = Collections.synchronizedList(new ArrayList<Boolean>(1));