Return-Path: Delivered-To: apmail-tomcat-users-archive@www.apache.org Received: (qmail 56536 invoked from network); 24 Sep 2008 12:46:20 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 24 Sep 2008 12:46:20 -0000 Received: (qmail 51892 invoked by uid 500); 24 Sep 2008 12:46:05 -0000 Delivered-To: apmail-tomcat-users-archive@tomcat.apache.org Received: (qmail 51860 invoked by uid 500); 24 Sep 2008 12:46:05 -0000 Mailing-List: contact users-help@tomcat.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: "Tomcat Users List" Delivered-To: mailing list users@tomcat.apache.org Received: (qmail 51849 invoked by uid 99); 24 Sep 2008 12:46:05 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 24 Sep 2008 05:46:04 -0700 X-ASF-Spam-Status: No, hits=1.2 required=10.0 tests=SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [196.25.240.75] (HELO ctb-mesg5.saix.net) (196.25.240.75) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 24 Sep 2008 12:45:02 +0000 Received: from animal (dsl-243-127-29.telkomadsl.co.za [41.243.127.29]) by ctb-mesg5.saix.net (Postfix) with SMTP id 1ADCC2816 for ; Wed, 24 Sep 2008 14:44:51 +0200 (SAST) Message-ID: <009b01c91e43$7bb56f60$0300000a@animal> From: "Johnny Kewl" To: "Tomcat Users List" References: <4D53604B61C826418EDE615CEA56915F012C3C54@EXCHANGE02.connaughtplc.local> Subject: Re: Tomcat thread blocking Date: Wed, 24 Sep 2008 14:45:42 +0200 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 080805-0, 2008/08/05), Outbound message X-Antivirus-Status: Clean X-Virus-Checked: Checked by ClamAV on apache.org ----- Original Message ----- From: "Darren Kukulka" To: Sent: Wednesday, September 24, 2008 9:37 AM Subject: Tomcat thread blocking Hi, I've recently observed a scenario in Tomcat 6.0.13 64-bit under SUN JDK 1.6_03 (x64 Windows platform), where a large number of threads show a status of BLOCKED. Can someone please advise the easiest and most effective way of helping identify the original cause of the block?....or have I just opened up a can of worms?! The behaviour is not something I can replicate so I need a method for in situ investigation, before I have to restart Tomcat to restore service (after a while Tomcat consumes too much CPU and becomes unresponsive) Any pointers would be much appreciated. ============================== Google for VisualVM... its in the later Java versions.... Heap Dumps, Thread Dumps... its like JConsole on steroids ;) --------------------------------------------------------------------------- HARBOR : http://www.kewlstuff.co.za/index.htm The most powerful application server on earth. The only real POJO Application Server. See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm --------------------------------------------------------------------------- --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org For additional commands, e-mail: users-help@tomcat.apache.org