JDBC and Oracle

[hongx]

I have a question about JDBC and Oracle. 
In my Jsp I make a connection pool bean to connect with Oracle. And I
found when I access the Oracle it will build a new session every time.
So at last I can't connect  with Oracle when it reaches the max session
number. Just when I restart Tomcat the sessin disappear. But if I don't
use the bean to connect with Oracle (direct write connection pool in the
jsp page), I found there is no new session built. Help me!!!