[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
I put this on the roadmap View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3848146#3848146 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3848146 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
I'd suggest to make use of the oswego concurrent library instead of using simple synchronisation. e.g. use EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap instead of HashMap this will both: - enshure we use the 'best-of-breed' solution for concurrent access - be as close as possible to the upcomming JDK 5.0 that includes the java.util.concurrent classes based on the oswego-library. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3848129#3848129 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3848129 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
We cannot let logging introduce errant behavior. If the info required for logging cannot be obtained in a thread safe manner without undue performance impact, then we do need to guard against failures due to the unsafe access and catch the exception. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847873#3847873 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847873 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
Would you be happy if the printXXX() and toString() methods would catch(Throwable) and not propagate it ? Bela View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847850#3847850 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847850 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
my company (10 empl., several hundred instances of J2EE-application-servers) is planning to use JBoss application-server in production starting 2005. I'll be technically responsible for this. >From an enterprise customers standpoint anything that is known to fail 'every now and >then' is not just being seen as bad programming practice, but basically not >acceptable... I'll review this synchronisation issue in more detail to find solution that hopefully does not compromise performance. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847822#3847822 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847822 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
bela: the price is that a business-transaction might fail just because loglevel is set to 'INFO' I don't think this is a real good idea. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847821#3847821 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847821 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
Yes. I'm willing to pay the price for occasional exceptions though in print() methods, but would not want to synchronize them at all. Norbert et al: Keep those bug reports coming ! Bela View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847771#3847771 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847771 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
I think this is a good point. I can see this exception probably doesn't happen that often with REPEATABLE_READ and up. But with more relaxed isolation levels, it can be a problem. Bela and I will be meeting soon. We should visit issue. What do you think, Bela? -Ben View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847746#3847746 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847746 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
btw: this is not just an issue of debugging - other methods like the various 'printInfo()' (even in TreeCache()) eventually throwsConcurrentModificationException when being called while the cache is in use. If we want to keep the underlying Collections unsynchronized for performance-reasons, we must never pass references to them. methods like 'LockMap.readerOwners()' are a 'must not' in respect to concurrency. I guess all the synchronizing must be carefully reviewed before this may go gold. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847734#3847734 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847734 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
e.g. in NodeMap it dosn't help that the method readerOwners() is synchronized, but the Collection (readOwnerList_) being returned by it being unsynchronized. It wouldn't even help to make the IdentityLock.toString()-method synchronized, since the JVM's lock on the IdentityLock instance does not lock the NodeMap, which would be required to hinder the NodeMap's synchronized method's (which lock the NodeMap, but not it's instance-variables) to excecute and modify the concurrenty accessed readOwnerList_ IMHO the only way to archive this is to use the synchronized version instead(created by java.util.Collection.synchronizedCollection(Collection)). View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847730#3847730 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847730 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
[JBoss-dev] [Caches on JBoss (Caches/JBoss)] - Re: ConcurrentModificationException in log.debug() statement
I've notices these kind of exceptions in many areas of jboss-cache's 'toString()' methods... It's because all the Collections being used (e.g. ArrayList for readOwnerList in LockMap.java, HashMap for data in Node.java ... ) are all unsynchronized and throw ConcurrentModificationException whenever being modified in another thread while being iterated. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3847721#3847721 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3847721 --- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php ___ JBoss-Development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
