Insert into JBoss Pojo Cache gets Blocked forever

[nirajal]

We are currently using JBoss Cache Version 1.4.0.SP1 with JGroups 2.2.8. We are having the folliwng scenario:
We are having 10 instances on the server where very instance is trying to insert data in the PojoCache after 2 secs with a different key but in the same region. It works fine for about 12 hrs in the production environment but then the insert into the PojoCache gets blocked forever. One more aspect is that the insert into the PojoCache is happening as a part of a synchronous block. We could not figure out why the issue is coming. Any help regarding the same would be really benefecial.

[ben.wang]

Have you tried to turn on the log to see what happened? Maybe there is some deadlock problem.

[nirajal]

It is a deadlock problem. We could not figure out why it was happening inspite of the synchronized block. Is there any stratey we can follow to avoid such an issue while using the JBoss Cache in high performance environment.