RE: Shutdown hook for correctly unloading drivers
Ok, thanks. Having a bit of an issue early on, since I'm notusing an IDE of any kind to embed it. -Original Message- From: Mark Thomas [mailto:ma...@apache.org] Sent: Tuesday, April 06, 2010 5:56 PM To: Tomcat Users List Subject: Re: Shutdown hook for correctly unloading drivers On 06/04/2010 23:38, Propes, Barry L wrote: Hi Mark, I've downloaded this profiler, but it tells me it's good for 15 dayswhat's the provision for having this free? I have an OpenSource license. A full license isn't that expensive. I've bought one a couple of times when I needed one for projects at work. Mark Thanks, Barry -Original Message- From: Mark Thomas [mailto:ma...@apache.org] Sent: Friday, March 26, 2010 7:27 AM To: Tomcat Users List Subject: Re: Shutdown hook for correctly unloading drivers On 26/03/2010 11:52, Timo Meinen wrote: Hi, I would like to know, if there is a shutdown-hook for Tomcat available. Or what the prefered way is, to correctly unload drivers like JDBC drivers. Unloading the drivers seems to be important for us, because after redeploying the web appliction to often during continuous integration leads to a OutOfMemory-Errors. And although Tomcat tells me, that it forces the driver to unload, I can see a significant amount of memory allocated additionally each time the webapp is redeployed. Tomcat has unloaded the driver. That won't be causing your memory leak. The memory leak prevention doesn't detect every possible cause of a leak. Get yourself a profiler (I use YourKit because they give open source committers free licenses) and follow these steps: http://markmail.org/message/fcbvwapt6afyndxn Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Shutdown hook for correctly unloading drivers
Hi Mark, I've downloaded this profiler, but it tells me it's good for 15 dayswhat's the provision for having this free? Thanks, Barry -Original Message- From: Mark Thomas [mailto:ma...@apache.org] Sent: Friday, March 26, 2010 7:27 AM To: Tomcat Users List Subject: Re: Shutdown hook for correctly unloading drivers On 26/03/2010 11:52, Timo Meinen wrote: Hi, I would like to know, if there is a shutdown-hook for Tomcat available. Or what the prefered way is, to correctly unload drivers like JDBC drivers. Unloading the drivers seems to be important for us, because after redeploying the web appliction to often during continuous integration leads to a OutOfMemory-Errors. And although Tomcat tells me, that it forces the driver to unload, I can see a significant amount of memory allocated additionally each time the webapp is redeployed. Tomcat has unloaded the driver. That won't be causing your memory leak. The memory leak prevention doesn't detect every possible cause of a leak. Get yourself a profiler (I use YourKit because they give open source committers free licenses) and follow these steps: http://markmail.org/message/fcbvwapt6afyndxn Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Shutdown hook for correctly unloading drivers
On 06/04/2010 23:38, Propes, Barry L wrote: Hi Mark, I've downloaded this profiler, but it tells me it's good for 15 dayswhat's the provision for having this free? I have an OpenSource license. A full license isn't that expensive. I've bought one a couple of times when I needed one for projects at work. Mark Thanks, Barry -Original Message- From: Mark Thomas [mailto:ma...@apache.org] Sent: Friday, March 26, 2010 7:27 AM To: Tomcat Users List Subject: Re: Shutdown hook for correctly unloading drivers On 26/03/2010 11:52, Timo Meinen wrote: Hi, I would like to know, if there is a shutdown-hook for Tomcat available. Or what the prefered way is, to correctly unload drivers like JDBC drivers. Unloading the drivers seems to be important for us, because after redeploying the web appliction to often during continuous integration leads to a OutOfMemory-Errors. And although Tomcat tells me, that it forces the driver to unload, I can see a significant amount of memory allocated additionally each time the webapp is redeployed. Tomcat has unloaded the driver. That won't be causing your memory leak. The memory leak prevention doesn't detect every possible cause of a leak. Get yourself a profiler (I use YourKit because they give open source committers free licenses) and follow these steps: http://markmail.org/message/fcbvwapt6afyndxn Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Shutdown hook for correctly unloading drivers
From: Steffen Heil [mailto:li...@steffen-heil.de] Subject: AW: Shutdown hook for correctly unloading drivers This does not hold, as soon as Threads are involved, right? I don't understand your comment; Thread objects always exist, and what do you think that has to do with unloading classes? - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Shutdown hook for correctly unloading drivers
From: Steffen Heil [mailto:li...@steffen-heil.de] Subject: AW: Shutdown hook for correctly unloading drivers However, there are web applications that have own threads (file reaper, connection pool, etc.). It's the application's responsibility to manage those threads, and shut them down when the application is stopped. This is one of the purposes of the various lifecycle listeners defined in the servlet spec. Any application that fails to manage the threads it creates is inherently broken. I am thinking about a strategy to iterate over all running threads and interrupt (and if absolutely necessary stop) all threads started by a certain classloader Threads aren't started by or associated with a classloader, other than temporarily inheriting the one from the parent thread (which is dynamically changeable). - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Shutdown hook for correctly unloading drivers
On 26/03/2010 11:52, Timo Meinen wrote: Hi, I would like to know, if there is a shutdown-hook for Tomcat available. Or what the prefered way is, to correctly unload drivers like JDBC drivers. Unloading the drivers seems to be important for us, because after redeploying the web appliction to often during continuous integration leads to a OutOfMemory-Errors. And although Tomcat tells me, that it forces the driver to unload, I can see a significant amount of memory allocated additionally each time the webapp is redeployed. Tomcat has unloaded the driver. That won't be causing your memory leak. The memory leak prevention doesn't detect every possible cause of a leak. Get yourself a profiler (I use YourKit because they give open source committers free licenses) and follow these steps: http://markmail.org/message/fcbvwapt6afyndxn Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Shutdown hook for correctly unloading drivers
Hi Mark, thank you for the answer. I do have a YourKit license for our open source framework, so I will profile my webapp. Tomcat has unloaded the driver. That won't be causing your memory leak. Does this mean, that the additional memory which is allocated after a redeploy cannot be the mysql-driver? Timo - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Shutdown hook for correctly unloading drivers
On 26/03/2010 12:35, Timo Meinen wrote: Hi Mark, thank you for the answer. I do have a YourKit license for our open source framework, so I will profile my webapp. Tomcat has unloaded the driver. That won't be causing your memory leak. Does this mean, that the additional memory which is allocated after a redeploy cannot be the mysql-driver? Very unlikely. A profiler will show what is really going on. Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Shutdown hook for correctly unloading drivers
From: Steffen Heil [mailto:li...@steffen-heil.de] Subject: AW: Shutdown hook for correctly unloading drivers How does tomcat unload classes? It doesn't, at least not directly. Tomcat simply eliminates all references to the classes; the actual unloading is done by GC at some point in the future. Is there even a way in java to do this? Just the above. But making the classes unreachable should be adequate for whatever purpose you have in mind. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
