I have been load testing our code which takes a request from the website performs some checking then updates a db2 database table. We are using a jdbc connection pool and everything is fine until I increased the number of requests to around 3 per second. Then we start to see some strange behaviour. Connections to the db seem to be closed by themselves, connection.close() is not called on the connections that have closed prematurely I'm sure of that. I have checked through the code several times and can't find a reason for this. Does this point to a problem with the jdbc connection pool or the database itself?