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Just getting more confused. If I increase the "sleep", the "list" increases, too:

    public void testTimerStart() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-TimerStart.bpmn2");
          StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
          final List list = new ArrayList();
          ksession.addEventListener(new DefaultProcessEventListener() {
               public void afterProcessStarted(ProcessStartedEvent event) {
                    list.add(event.getProcessInstance().getId());
               }
          });
          Thread.sleep(250);
          assertEquals(0, list.size());
        for (int i = 0; i < 5; i++) {
             ksession.fireAllRules();
             Thread.sleep(500);
        }
        // the longer the time is the more process instances are in "list"
            Thread.sleep(3500);
        assertEquals(5, list.size());
    }
 

junit.framework.AssertionFailedError: expected:<5> but was:<9>