On 2/12/2015 1:46 PM, Wirth, Kevin wrote:
-----Original Message-----
From: David kerber [mailto:dcker...@verizon.net]
Sent: Thursday, February 12, 2015 1:00 PM
To: Tomcat Users List
Subject: Re: tomcat severe error when shutting down service but startup is clean
On 2/12/2015 12:48 PM, Cris Berneburg - US wrote:
-----Original Message-----
From: David kerber [mailto:dcker...@verizon.net]
Sent: Thursday, February 12, 2015 9:40 AM
To: Tomcat Users List
Subject: Re: tomcat severe error when shutting down service but
startup is clean
On 2/12/2015 9:06 AM, Wirth, Kevin wrote:
I keep getting these weird tomcat errors on shutdown on a newly built system
using tomcat 7.0.57 on a windows 2012 server with jdk 1.7 that I can't figure
out. This is the catalina log:
Feb 12, 2015 8:54:31 AM org.apache.catalina.loader.WebappClassLoader
clearReferencesJdbc
SEVERE: The web application [/identityiq] registered the JDBC driver
[com.microsoft.sqlserver.jdbc.SQLServerDriver] but failed to unregister it when
the web application was stopped. To prevent a memory leak, the JDBC Driver has
been forcibly unregistered.
Feb 12, 2015 8:54:31 AM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: The web application [/identityiq] appears to have started a thread
named [Thread-3] but has failed to stop it. This is very likely to create a
memory leak.
I ran into this a while back, and it means exactly what it says: the db driver
is being registered (loaded), but not being unloaded. I fixed it by putting
the db driver unload commands in a contextDestroyed method.
David
I have the same issue as Kevin. What "unload commands" code did you call in the
contextDestroyed method? Are those methods "universal"? The reason I ask is because we
use different ODBC drivers for different environments.
I call this code from my .contextDestroyed method (I didn't write it, I copied
it from somewhere on the web):
public static void unRegisterDrivers() {
try {
for ( Enumeration<Driver> drivers = DriverManager.getDrivers();
drivers.hasMoreElements(); ) {
DriverManager.deregisterDriver( drivers.nextElement() );
}
} catch ( Exception e ) {
/* log the exception */
}
}
Thank you for your response. Where do I put this code as I am new to tomcat?
The application I am deploying is not written by me so I don't know the code.
It needs to be called from the .contextDestroyed method of whatever
class is defined as a listener in your application. I don't know if it
can be done without modifying existing classes or not.
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