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" <[EMAIL PROTECTED]>
04/03/2003 02:20 PM
Please respond to "Tomcat Users List"
To: "Tomcat Users List" <[EMAIL PROTECTED]>
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:[EMAIL PROTECTED]
>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" <[EMAIL PROTECTED]>
>04/03/2003 01:16 PM
>Please respond to "Tomcat Users List"
>
>
> To: "Tomcat Users List" <[EMAIL PROTECTED]>
> 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
>
>
>
>
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