Hey again folks, I understand well better after the informative discussion between you two about this subject.
Do you have an idea about the mbean unregistration exception? Cheers, Manu On May 26, 2013 5:06 PM, "Caldarale, Charles R" <chuck.caldar...@unisys.com> wrote: > > From: Leon Rosenberg [mailto:rosenberg.l...@gmail.com] > > Subject: Re: Exeptions after upgrading to tomcat 7 > > > First we are talking about a ThreadLocal, not Thread. > > Read the logs again; besides the ThreadLocal abuse, there are two threads > left lying around: > > > > SEVERE: The web application [/solr] appears to have started a thread > named > > > [localhost-startStop-1-SendThread(zookeeper2:2181)] but has failed to > stop > > > it. This is very likely to create a memory leak. > > > SEVERE: The web application [/solr] appears to have started a thread > named > > > [localhost-startStop-1-EventThread] but has failed to stop it. This is > very > > > likely to create a memory leak. > > > Maybe I'm missing something here, but I never seen how ThreadLocal does > > real harm, neither I can imagine it, please enlighten me ;-) > > Abusing ThreadLocal (which is what's going on here) can have very serious > side effects, depending on what's stored via the reference. For example, > if something specific to the request or session is kept in the ThreadLocal > and not refreshed on the next unrelated request, inadvertent data sharing > and potential corruption can occur. During one of the Tomcat > get-togethers, we had discussed associating ThreadLocal instances with > sessions rather than Threads, but that would have been a good bit of work. > We settled on just purging such threads from the pool. > > Libraries written for non-thread-pool environments should be documented as > such, and used only with great caution in server environments. > > - 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 > >
