From oracle-l-bounce@freelists.org Mon Aug 15 15:30:52 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id j7FKUjFT015517 for ; Mon, 15 Aug 2005 15:30:45 -0500 X-ClientAddr: 206.53.239.180 Received: from turing.freelists.org (freelists-180.iquest.net [206.53.239.180]) by air891.startdedicated.com (8.12.10/8.12.10) with ESMTP id j7FKU8IP015471 for ; Mon, 15 Aug 2005 15:30:13 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 422061DDF3D; Mon, 15 Aug 2005 14:47:19 -0500 (EST) Received: from turing.freelists.org ([127.0.0.1]) by localhost (turing [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 15543-10; Mon, 15 Aug 2005 14:47:18 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 7B8631DDED4; Mon, 15 Aug 2005 14:47:18 -0500 (EST) From: "Marc Perkowitz" To: Cc: Subject: RE: Tomcat problem Date: Mon, 15 Aug 2005 14:44:29 -0500 Message-ID: <000a01c5a1d1$c531a8d0$731511ac@MTPSYS> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000B_01C5A1A7.DC5BA0D0" In-Reply-To: <4300E42B.2040704@uwsa.edu> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-archive-position: 23994 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: mperkowitz@comcast.net Precedence: normal Reply-To: mperkowitz@comcast.net X-list: oracle-l X-Virus-Scanned: by amavisd-new-20030616-p9 (Debian) at avenirtech.net X-mailscan-MailScanner-Information: Please contact the ISP for more information X-mailscan-MailScanner: Found to be clean X-MailScanner-From: oracle-l-bounce@freelists.org X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on air891.startdedicated.com X-Spam-Status: No, hits=-4.7 required=5.0 tests=AWL,BAYES_00,HTML_50_60, HTML_FONTCOLOR_UNKNOWN,HTML_MESSAGE autolearn=no version=2.63 ------=_NextPart_000_000B_01C5A1A7.DC5BA0D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Lots of possibilities here, but it is likely an application issue. I presume that it is using JSP's for the screen interface? =20 =20 Is there any sort of persistence layer being used? Does the application start and stop threads? Does it use thread-safe methods or do its own synchronization? =20 Tomcat is essentially a JVM container. The Java application code has to support threading (using locks) or use thread-safe methods or it will = crash. =20 Marc. =20 -----Original Message----- From: oracle-l-bounce@freelists.org = [mailto:oracle-l-bounce@freelists.org] On Behalf Of LeRoy Kemnitz Sent: Monday, August 15, 2005 1:51 PM To: ryan_gaffuri@comcast.net Cc: oracle-l@freelists.org Subject: Re: Tomcat problem =20 I have 5 users clicking 'submit' at the same time. And this causes a = heap dump. Tomcat hosts the App. I assume it is a threading problem or = locked sessions causing the problem. =20 ryan_gaffuri@comcast.net wrote: =20 can you be a little more specific about what the problem is? Tomcat is = just a webserver? What do you mean by threading? What is being threaded? Do = you just mean the same webpage launched by multiple users?=20 -------------- Original message --------------=20 > All -=20 >=20 > I realize this is an Oracle list but taking a shot in the dark that=20 > someone may be able to help me. I am having a problem with Tomcat and=20 --=20 LeRoy Kemnitz UW System Administration Database Administrator 780 Regent Street, #246 Madison, WI 53714 Phone: (608) 265 -5775 Fax: (608) 265 - 2090 ------=_NextPart_000_000B_01C5A1A7.DC5BA0D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Lots of possibilities here, but it = is likely an application issue. I presume that it is using = JSP’s for the screen interface?

Is there any sort of persistence = layer being used? Does the application start and stop threads? = Does it use thread-safe methods or do its own synchronization?

Tomcat is essentially a JVM container. The Java application code has to support threading = (using locks) or use thread-safe methods or it will crash.

Marc.

-----Origi= nal Message-----
From: oracle-l-bounce@freelists.org [mailto:oracle-l-bounce@freelists.org] = On Behalf Of LeRoy Kemnitz
Sent: Monday, August 15, = 2005 1:51 PM
To: = ryan_gaffuri@comcast.net
Cc: = oracle-l@freelists.org
Subject: Re: Tomcat = problem

I have 5 users = clicking 'submit' at the same time. And this causes a heap dump. = Tomcat hosts the App. I assume it is a threading problem or locked sessions causing the problem.

ryan_gaffuri@comcast.net = wrote:

can you be a = little more specific about what the problem is? Tomcat is just a webserver? What do = you mean by threading? What is being threaded? Do you just mean the same = webpage launched by multiple users?

-------------- = Original message --------------

> All -
>
> I realize this is an Oracle list but taking a shot in the dark that =
> someone may be able to help me. I am having a problem with Tomcat = and

--

LeRoy Kemnitz

UW System =
Administration

Database =
Administrator

780 Regent Street, =
#246

Madison, WI 53714

Phone: (608) 265 =
-5775

Fax: (608) 265 - =
2090

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