Please see http://stackoverflow.com/questions/36755445/why-am-i-getting-exception-on-kiesession-reload for a discussion of this issue. In short, I'm running a simple test where the KieSession is operating in STREAM mode. I define "MyEvent" as an event and specify that it should expire in 3s. After inserting the event, I dispose of the KieSession, sleep for 5s (to allow the timer to expire), and then attempt to reload the session. However, when I attempt the session reload, I get Exceptions as shown.