- Enable ccm on datasource to be tracked. It can be done in web console or by editing xml configuration directly
- Configure ccm to track leaked connections. Debug must be set to true
<datasource ... enabled="true" use-ccm="true">
cached connection manager tag is not in default configuration, you need to add it to end of jca:1.1 namespace
It is that simple. Unlike glassfish 3.1 connection leak is done immediately after servlet ends, you will not run out of connections anymore.