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From Jason Pell <>
Subject Re: Tomcat/firewall/oracle timeout problem
Date Fri, 02 Feb 2001 00:42:47 GMT
Instead of checking if the Connection is null, why not try a simple test of
the connection is still active.

Try a query: "select USER from dual" for instance, if an exception is thrown
indicates the connection is invalid and needs to be reset.

You might also like to take a look at the connection pooling software from
javaexchange, called DbConnectionBroker, which can take care of and reinitialise

expired/invalid connections.


Yin Tse wrote:

> Hi all,
> I'm having a problem with a jdbc connection object between tomcat and an
> oracle server. The 2 machines are separated by a firewall which was
> configured to allow access to the oracle server from the tomcat server only.
> The problem starts when the timeout period(which can be set to an arbitray
> time period) of idle time runs out. It sends a timeout signal and that
> breaks the jdbc connection. The application then freezes any attempts to log
> in/manage your account or do activities which need database connection. But
> tomcat still works fine, any servlets which do not need database connection
> works fine.
> I added some code to check if my connection object is null and to create a
> new one if it is so. That didn't solve the problem which means that the
> connection object is not killed, but its content (like db driver, conn url ,
> login & password etc..)is somehow scrambled. My question is how can I manage
> those jdbc connection objects and how to figure out when something went
> wrong with the connection object ? Thanks all.
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Jason Pell
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