Easiest thing to do is check out the JMX console

By default, this runs at:

http://host:8080/jmx-console

The console provides an HTML view of all the MBeans running in JBoss. All ConnectionPools are MBeans and as a result, you can view the particular statistics for the pool. For example, JBoss ships with a default datasource configuration with a JNDI name of DefautDS to view the stats for this datasource navigate to the console and find the entry

jboss.jca:service=ManagedConnectionPool,name=DefaultDS

selecting this will give you a set of statistics about the pool (min/max/inuse).

You can accomplish the same thing using the twiddle.sh application in your

<jboss-root>/bin directory but for now the JMX console should give you a start.