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From Philipp von dem Bussche <>
Subject Re: [dbcp] Monitoring of handed out connections
Date Thu, 11 Mar 2004 22:15:03 GMT
Hi Dirk,
it's 4.1.29.
Thanks for your reply.

Dirk Verbeeck wrote:
> Hi Phil,
> What version of tomcat are you using?
> -- Dirk
> wrote:
>> Hi,
>> to get noticed about the number of connections, which are handed out 
>> by the data source, we extended BasicDataSource. getConnection() was 
>> overwritten so that everytime a connection is released a log file 
>> entry is written. At first we used log4J for Logging, but we had to 
>> recognize, that placing our new jar and a jar for log4j into 
>> common/lib under the tomcat tree, results in an error of another 
>> webapp, which was supposed to use its own log4j but now acts on the 
>> one, which is placed in common/lib (<-- this seems to be a mistake in 
>> class loading because it is describe just the other way around on 
>> tomcat homepage).
>> Anyway, we are looking for a new way to do the monitoring. One 
>> solution could be using a tomcat FileLogger. But the problem will be 
>> the classloader again. Since our data source has to be placed under 
>> common/lib, the FileLogger is part of catalina.jar, which is actually 
>> under server/lib, we won't be able to make an instance from catalina 
>> FileLogger in our extended data source.
>> So my question is, has anybody ever faced a similiar problem or does 
>> anybody know of a solution to this ?? Monitoring of data sources is a 
>> very important task here at the moment.
>> Thanks,
>> Phil.
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