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. 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 ********************************************************************************************************************
