On Mon, 2012-01-23 at 05:33 -0800, gnath wrote: > Hello Robert, > > > We are talking about an app which has been grown since years and now migrated > to Tomcat. Most of the main code is migrated to use spring jdbc and spring > 3.0 mvc. > Would you recommend some way that i can spot the issue from inspecting the > open file descriptors once the server hangs/crashes so that i can check the > code to see what you are saying? Please do let me know.
Try running FindBugs on your code. In most cases, it will detect when you do not correctly close a file. Dan > > > All, please help if you can give me any hints from the information i provided > down below. > > > Thanks > -G > > > > ________________________________ > From: Purvis Robert (NHS CONNECTING FOR HEALTH) <robert.pur...@nhs.net> > To: Tomcat Users List <users@tomcat.apache.org>; gnath > <gautam_exquis...@yahoo.com> > Sent: Monday, January 23, 2012 1:32 AM > Subject: RE: Tomcat 6.0.35-SocketException: Too many open files issue with > > Sorry to possibly state the obvious, but are there perhaps files that are not > being closed? > > This can often happen if code goes into a "catch", and a file is not closed. > Best to have a "finally" block which checks if a file is open, and closes it. > > > Robert Purvis > > -----Original Message----- > From: gnath [mailto:gautam_exquis...@yahoo.com] > Sent: 22 January 2012 08:01 > To: users@tomcat.apache.org > Subject: Tomcat 6.0.35-SocketException: Too many open files issue with > > Hello, > > We have been seeing "SocketException: Too many open files" in production > environment(Linux OS running Tomcat 6.0.35 with sun's JDK 1.6.30) every day > and requires a restart of Tomcat. When this happened for the first time, we > searched online and found people suggesting to increase the file descriptors > size and we increased to 4096. But still the problem persists. We have the > Orion App Server also running on the same machine but usually during the day > when we check the open file descriptor by command: ls -l /proc/PID/fd, its > always less than 1000 combined for both Orion and Tomcat. > > > Here is the exception we see pouring in the logs once it starts: This > requires us to kill java process and restart tomcat. Our Tomcat configuration > maxThreadCount is 500 with minSpareThreads=50 in server.xml > > > SEVERE: Socket accept failed > java.net.SocketException: Too many open files > at java.net.PlainSocketImpl.socketAccept(Native Method) > at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:408) > at java.net.ServerSocket.implAccept(ServerSocket.java:462) > at java.net.ServerSocket.accept(ServerSocket.java:430) > at > org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:61) > at > org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:352) > at java.lang.Thread.run(Thread.java:662) > > ulimit -a gives for the user where Tomcat is running. > > > open files (-n) 4096 > > > Please let me know what could be the issue here and how can i resolve this > 'Too many open files' issue. > > Thanks > -G > > ******************************************************************************************************************** > > This message may contain confidential information. If you are not the > intended recipient please inform the > sender that you have received the message in error before deleting it. > Please do not disclose, copy or distribute information in this e-mail or take > any action in reliance on its contents: > to do so is strictly prohibited and may be unlawful. > > Thank you for your co-operation. > > NHSmail is the secure email and directory service available for all NHS staff > in England and Scotland > NHSmail is approved for exchanging patient data and other sensitive > information with NHSmail and GSi recipients > NHSmail provides an email address for your career in the NHS and can be > accessed anywhere > For more information and to find out how you can switch, visit > www.connectingforhealth.nhs.uk/nhsmail > > ********************************************************************************************************************
