code:
System.out.println("starting the async execution - will sleep now");
        Thread.sleep(5000);
        System.out.println("ending the async execution");
        return new ExecutionResults(); // was null before, hence the error below Iguess

11:57:42,787 INFO  [stdout] (EJB default - 6) starting the async execution - will sleep now
11:57:47,788 INFO  [stdout] (EJB default - 6) ending the async execution
11:57:47,791 WARN  [org.jbpm.executor.impl.AvailableJobsExecutor] (EJB default - 6) Error during command org.redhat.gss.AsyncCommand execution null
11:57:47,802 WARN  [org.jbpm.executor.entities.ErrorInfo] (EJB default - 6) trimming stacktrace as it's too long : 5376
11:57:48,777 INFO  [stdout] (EJB default - 8) starting the async execution - will sleep now
11:57:53,804 INFO  [stdout] (EJB default - 8) ending the async execution
11:57:53,806 WARN  [org.jbpm.executor.impl.AvailableJobsExecutor] (EJB default - 8) Error during command org.redhat.gss.AsyncCommand execution null
11:57:53,807 WARN  [org.jbpm.executor.entities.ErrorInfo] (EJB default - 8) trimming stacktrace as it's too long : 5376
11:57:54,812 INFO  [stdout] (EJB default - 10) starting the async execution - will sleep now
11:57:59,813 INFO  [stdout] (EJB default - 10) ending the async execution
11:57:59,814 WARN  [org.jbpm.executor.impl.AvailableJobsExecutor] (EJB default - 10) Error during command org.redhat.gss.AsyncCommand execution null
11:57:59,816 WARN  [org.jbpm.executor.entities.ErrorInfo] (EJB default - 10) trimming stacktrace as it's too long : 5376
11:58:00,780 INFO  [stdout] (EJB default - 7) starting the async execution - will sleep now
11:58:05,782 INFO  [stdout] (EJB default - 7) ending the async execution
11:58:05,783 WARN  [org.jbpm.executor.impl.AvailableJobsExecutor] (EJB default - 7) Error during command org.redhat.gss.AsyncCommand execution null
11:58:05,784 WARN  [org.jbpm.executor.entities.ErrorInfo] (EJB default - 7) trimming stacktrace as it's too long : 5376