Lets say you wrote a singleton to handle DB connection pooling and your database can handle only 20 connections. With 3 nodes on a cluster and 3 singletons you will effectively be allowing 60 connections to the DB instead of 20. An example that might not be pragmatic (since most app servers will provide this feature) but an example never the less
Joined: Jan 28, 2009
subject: What are all the Common Servlet Programming practises for Clustered Environment?