Hi manik, Iam newbie to jboss cache, Please clarify me regarding my understanding. I am using the POJO cache in clustered environment as follows. public class POJO{ private int count; private setCount(int count){ this.count = count; } private int getCount(){ return count; } } A POJO object will be created and attached to the cache through a servlet in instance1 as follows POJO obj = new POJO(); cache = PojoCacheFactory.createCache("replSync-service.xml", true); cache.attach("monitor", obj); // I hope "/monitor" will be the FQN under which obj will be stored Now 2 transactions t1,t2 will be trying to increment the value of count from instance2,instance3 respectively as follows cache = PojoCacheFactory.createCache("replSync-service.xml", true); POJO obj = (POJO) cache.find("monitor"); tx.begin(); int currentValue = obj.getCount(); currentValue++; obj.setCount(currentValue); tx.commit(); Now how can i guarantee that the count value is not over written by t2 which was written by t3 Can i acquire explicit lock on "/monitor" before starting a transaction so that no other transaction in other instance should be able to read/write on "/monitor" ? Iam expecting that if isolation level "SERIALIZABLE" is used i don't need to bother about the above problem and repeat the statements in between begin,commit untill it succeeds. Am i right ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4120091#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...