You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@tomcat.apache.org by Iain Sanderson <sa...@mc.duke.edu> on 2003/04/04 15:52:39 UTC
RE: Tomcat unstable - Dr. Watson. Why? follow up
I ran my web application last night starting Tomcat from the command line
( not as a service) and it has worked well, even during the period of
backup of the server from MN to 7am.
So, there is a flaw (?bug) that I can predictably create in
Tomcat4.x/Win32 that causes the Tomcat win32 service to crash, (not the
JVM), when using a connection pool and the database server is busy.
Is this a windows or a Tomcat issue? It is a practical issue for Tomcat
users - the service is much more convenient.
Iain.
"Iain Sanderson" <sa...@mc.duke.edu>
04/03/2003 03:51 PM
Please respond to "Tomcat Users List"
To: "Tomcat Users List" <to...@jakarta.apache.org>
cc:
Subject: RE: Tomcat unstable - Dr. Watson. Why?
Is that it?
Surely this is a Tomcat issue. Something is causing Tomcat to crash in a
Windows environmment, as you say, without it affecting the JVM. Is it just
a Windows issue? My other services don't crash.
Surely there must be something else I can do apart from change operating
systems?
Iain.
"Shapira, Yoav" <Yo...@mpi.com>
04/03/2003 02:51 PM
Please respond to "Tomcat Users List"
To: "Tomcat Users List" <to...@jakarta.apache.org>
cc:
Subject: RE: Tomcat unstable - Dr. Watson. Why?
Howdy,
Can't help you much more, as it seems a Windows issue. I've managed to
avoid running servers on windows machines so far and I don't plan to
start soon ;)
Yoav Shapira
Millennium ChemInformatics
>-----Original Message-----
>From: Iain Sanderson [mailto:sande010@mc.duke.edu]
>Sent: Thursday, April 03, 2003 2:43 PM
>To: Tomcat Users List
>Subject: RE: Tomcat unstable - Dr. Watson. Why?
>
>Hi,
>
>So if my JVM doesn't crash, but the Windows NT service that runs
Tomcat
>does, what can I do? What are the implications of what you just wrote?
>Stout.log and sterr.log are blameless, by the way.
>
>I guess I could run Tomcat from the command line, and not as a service,
>but I think I've tried this. The same web app crashes in the same way
on
>another server running Windows 2000 server. Would Linux be any better?
>
>Iain.
>
>
>
>
>"Shapira, Yoav" <Yo...@mpi.com>
>04/03/2003 02:20 PM
>Please respond to "Tomcat Users List"
>
>
> To: "Tomcat Users List" <to...@jakarta.apache.org>
> cc:
> Subject: RE: Tomcat unstable - Dr. Watson. Why?
>
>
>
>Howdy,
>No. I meant the hs_err_[pid] file, which is created by the HotSpot JVM
>automatically when it crashes. It's not the same as the stdout/stderr
>logs. If the file is not there, that's a good thing, it means your JVM
>did not crash.
>
>Yoav Shapira
>Millennium ChemInformatics
>
>
>>-----Original Message-----
>>From: Iain Sanderson [mailto:sande010@mc.duke.edu]
>>Sent: Thursday, April 03, 2003 2:16 PM
>>To: Tomcat Users List
>>Subject: RE: Tomcat unstable - Dr. Watson. Why?
>>
>>Hi,
>> regarding
>>>hs_err_.. etc
>>
>>I couldn't find a file named anything like this on my server. I do
have
>>stout.log and sterr.log , set in the registry for the JVM for Tomcat
>>service startup. Is this what you mean?
>>
>>Iain
>>
>>
>>
>>
>>"Shapira, Yoav" <Yo...@mpi.com>
>>04/03/2003 01:16 PM
>>Please respond to "Tomcat Users List"
>>
>>
>> To: "Tomcat Users List" <to...@jakarta.apache.org>
>> cc:
>> Subject: RE: Tomcat unstable - Dr. Watson. Why?
>>
>>
>>
>>Howdy,
>>Does your app server need to be available when your DB server is doing
>>backups? If not, you could always restart the app server at 7am.
>>
>>Is DBCP or something else doing keep-alive / sanity checks on the DB
>>connections? Or other keep-alive / ping type activity to the DB
>server?
>>If so, these checks could be hanging, or just spinning in a deadlock,
>if
>>the DB server is too busy to respond.
>>
>>>I'm running Tomcat 4.22 on Windows NT sp6 using the Java 1.41 VM as
a
>>>service with the -Xxms256m -Xxmx256m switches set in the registry
>for
>>
>>You mean -Xmx256m and -Xms256m, right? What if you allow more memory?
>>
>>>There is no information in Tomcat's logs at all. Windows just shuts
>>down
>>
>>Is there a JVM internal crash log? This is typically a hs_err_[pid]
>>file in the current working directory of the JVM.
>>
>>>the server are large ( Operating room schedules etc. Queries take
>0.15
>>to
>>>0.2 seconds, but page refreshes in Tomcat 5-6 seconds, which is
>>>acceptable. With incremental GC this increases to 17 seconds, which
is
>>>not.)
>>
>>Is it acceptable for the midnight-7am period? Or not acceptable even
>>during this time?
>>
>>>I'm sure the problem is due to database connections, but I can't
fault
>>my
>>>code. I'm using Tomcat's JNDI datasource pool (commons DBCP), set in
>>>server.xml. I have been very careful to close all my connections
>using
>>>the following code straight out of Tomcat's documentation (see below)
>>
>>Maybe you should add something to your app server that closes all DB
>>connections at midnight, and until 7am establishes DB connections on
>>demand, i.e. doesn't go through a pool. This will help isolate the
>>problem.
>>
>>Yoav Shapira
>>Millennium ChemInformatics
>>
>>
>>
>>
>>This e-mail, including any attachments, is a confidential business
>>communication, and may contain information that is confidential,
>>proprietary and/or privileged. This e-mail is intended only for the
>>individual(s) to whom it is addressed, and may not be saved, copied,
>>printed, disclosed or used by anyone else. If you are not the(an)
>>intended recipient, please immediately delete this e-mail from your
>>computer system and notify the sender. Thank you.
>>
>>
>>---------------------------------------------------------------------
>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>
>>
>
>
>
>
>This e-mail, including any attachments, is a confidential business
>communication, and may contain information that is confidential,
>proprietary and/or privileged. This e-mail is intended only for the
>individual(s) to whom it is addressed, and may not be saved, copied,
>printed, disclosed or used by anyone else. If you are not the(an)
>intended recipient, please immediately delete this e-mail from your
>computer system and notify the sender. Thank you.
>
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>
>
This e-mail, including any attachments, is a confidential business
communication, and may contain information that is confidential,
proprietary and/or privileged. This e-mail is intended only for the
individual(s) to whom it is addressed, and may not be saved, copied,
printed, disclosed or used by anyone else. If you are not the(an)
intended recipient, please immediately delete this e-mail from your
computer system and notify the sender. Thank you.
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-user-help@jakarta.apache.org