I was testing with a replicated cache in infinispan. And in an attempt to try it in 5.0CR4 I have found that I cannot use a replicated or invalidating cache (async or sync) that has fetchInMemoryState set to true unless I have FLUSH protocol provided with udp. I was able to reproduce this using the distributed jgroups-udp.xml file, which has FLUSH removed. When I tried with jgroups-tcp.xml it works without the FLUSH protocol as expected.

I have attached the test java file that is only using infinispan and is very basic that reproduces it every time I try. I also will attach the log file from both the coordinator and the joining peer that shows this issue.