I have had a few probelms with the SQL JDBC failing on common requests. These seem to be related to Proxool supplying a connection in one thread, then closing it in another thread during the housekeeping sweep while the JDBC driver is using it.
I have attached a log file web page. It contains only the Proxool log entries, and one JDBC entry (log event 31718).
You will note that around this log event number there are several Proxool entries which all happen during the same milli-second.
The server is a dual core XEON at 3.14GHz. This is running under Tomcat 5.5 with two applications using Proxool (with different pool names).
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