Hazelcast service stops working after a while
Rob reported that there were a long list of object which couldn't be found on mn-demo-5 and 8. It turned out that it was caused by the inactive hazelcast service. Restarting tomcat fixed the issue.
I also went through from mn-demo-1 to 11 and found the same issue on mn-demo-1,4,6,9,10 and 11.