tomcat-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From <MW...@loftware.com>
Subject RE: Auto-loading of the SQL Server JDBC Driver in 6.0.35
Date Fri, 02 Aug 2013 20:30:32 GMT
> From: Michael-O [mailto:1983-01-06@gmx.net]
> Sent: Friday, August 02, 2013 3:28 PM
> To: Tomcat Users List
> Subject: Re: Auto-loading of the SQL Server JDBC Driver in 6.0.35
> 
> Am 2013-08-02 21:24, schrieb MWick@loftware.com:
> > I expect that by putting the SQL Server JDBC4 driver jar
> > (sqljdbc4.jar) into ${CATALINA_HOME}/lib, that the driver would be
> > automatically available upon server start.  As expected, this works in
> > 6.0.33, but fails in 6.0.35.  It seems that the fix to Bug 51640 is
> > the cause of this, and in fact, setting driverManagerProtection to
> > false in the JreMemoryLeakPreventionListener allows this to work in
> > 6.0.35 as well.  I would not have expected that a change to the
> > MemoryLeak Listener would have changed the behavior of the JDBC
> > driver.
> >
> > I don't know the internals of the SQL Server driver, so I don't know
> > exactly why this is happening.  The MySQL driver loads without any
> > issue.
> 
> Why should the driver being loaded into memory if no one uses it?
> Actually, a driver is loaded into the container's classloader cache upon first
> access. This is what happens at least for me with the Oracle driver.
> 
> Everything else does not make sense to me.
> 
> Michael

Sorry, I wasn't clear.  It's not loading the driver into memory, but rather registering it
with the DriverManager that has changed, so that it can be loaded on the first request.  This
is no longer occurring.  

Mark



---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org


Mime
View raw message