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Tomcat DataSource pooling problem

Mario Mlinar

Joined: Feb 05, 2004
Posts: 1
I am using Tomcat 4.1.27.
I have a small application using DataSource pooling. Which works fine so far.
After reloading my application via an ant Manager my application can�t get a connection with this message:
java.sql.SQLException: Cannot load JDBC driver class 'null'
After I restarting Tomcat it works all well again ...
Can anybody help me?
Jon Crosby

Joined: Mar 17, 2004
Posts: 1
Have you found a solution to this problem yet? I have seen many of these questions in the forums, but never an answer that solves the problem. I have duplicated the Tomcat 4 online docs exactly but I am getting the same error message as you.
Mike Curwen
Ranch Hand

Joined: Feb 20, 2001
Posts: 3695

I've never seen it affect a DataSource connection before, but 4.1.27 had a known 'class reloading' bug that would kill a web application that was reloaded through the manager.

There is a hotfix available for that specific version, but otherwise, 4.1.30 is the current stable release, and it does not have this bug.
I agree. Here's the link:
subject: Tomcat DataSource pooling problem
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