I've further traced the root cause of my problems with threads sitting on
socket read, never timing out, never throwing an exception and sometimes
causing application deadlock (depending on where the socket read occurs)
down to the network. By comparing the output of lsof -i :1521 | grep
on
So while working on reproducing tomcat webapp hang as earlier discussed, a
different tomcat serving up a single webapp on same box also stopped
responding, jvm for this tomcat is still running but when trying to reach it
via browser I get error page of unable to connect.
Thread dumps for both
From: Jason Britton [mailto:jbritto...@gmail.com]
Subject: Re: tomcat 6.0.29 hung
My thoughts are this is the thread causing all the backup
AJP Thread 1 RUNNABLE, sitting on socketRead0, Has locked
0x2aaad303cad0 (a com.acompany.model.customer.CustomerData)
which almost all other
)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
On Fri, Oct 22, 2010 at 6:34 AM, Caldarale, Charles R
chuck.caldar...@unisys.com wrote:
From: Jason Britton [mailto:jbritto...@gmail.com]
Subject: Re: tomcat 6.0.29 hung
My thoughts
:908)
at java.lang.Thread.run(Thread.java:619)
On Fri, Oct 22, 2010 at 6:34 AM, Caldarale, Charles R
chuck.caldar...@unisys.com wrote:
From: Jason Britton [mailto:jbritto...@gmail.com]
Subject: Re: tomcat 6.0.29 hung
My thoughts are this is the thread causing all the backup
one of two of the hanging applications are doing db connection validation.
The application using DBCP configures it's SharedPoolDataSource using
setValidationQuery(select 'validationQuery' from dual);
setTestOnBorrow(true);
Funny enough, thread stacktrace below shows
Jason Britton wrote:
So while working on reproducing tomcat webapp hang as earlier discussed, a
different tomcat serving up a single webapp on same box also stopped
responding, jvm for this tomcat is still running but when trying to reach it
via browser I get error page of unable to connect.
Thanks for the insight Dave. I have several threads sitting spinning
on socket read at the moment and dba reports zero database locks of
any kind on database they're trying to read from (a qa database).
Quite baffled as to what's happening to these database connections and
why every now and then
This might be related, and don't know if you've read it - it's a bit out
of date, and depends on versions of stuff you're using, Jason.
http://forums.sun.com/thread.jspa?threadID=343023start=15tstart=0
-- D Mansfield
Jason Britton wrote:
Thanks for the insight Dave. I have several threads
On 22/10/2010 16:47, Jason Britton wrote:
one of two of the hanging applications are doing db connection validation.
The application using DBCP configures it's SharedPoolDataSource using
setValidationQuery(select 'validationQuery' from dual);
That looks weird. Is that really
From: Dave Mansfield [mailto:dmansfi...@sbcglobal.net]
Subject: Re: tomcat 6.0.29 hung
This might be related, and don't know if you've read it -
it's a bit out of date, and depends on versions of stuff
you're using, Jason.
http://forums.sun.com/thread.jspa?threadID=343023start=15tstart
On 21/10/2010 00:11, Jason Britton wrote:
Highly recommend trying out jvisualvm (it's in your jdk bin) if you're
running 1.6.
There's a standalone release - 1.3.1 - with more plugins some slightly
shinier toys.
https://visualvm.dev.java.net/
Even if you can't run it on the same machine as
I'll definitely will take a look at the standalone release. Thanks for the
info. I'm going to throw Cygwin/X on my desktop machine to hopefully be
able to pull up jvisualvm remotely and/or just use standalone version.
Perhaps Cygwin/X would also allow you to pull up VisualGC remotely?
On Thu,
jason,
Out of personal interest I have a question about the way you use jstack. I
came across this jstack cannot take dump of hung process problem before. I
once witnessed the same exceptions when chasing a deadlock.
This happened to me on ubuntu 10.4.0 (and 10.4.1) 64-bit using sun's jdk
On Thu, Oct 21, 2010 at 1:11 AM, Jason Britton jbritto...@gmail.com wrote:
Thankfully when I pulled up jvisualvm on the server and issued thread dumps,
even though the stacktraces for the threads did not come up within jvisualvm
the thread stacktraces were dumped to stdout.
I think this is
On 21/10/2010 13:49, Jason Britton wrote:
I'll definitely will take a look at the standalone release. Thanks for the
info. I'm going to throw Cygwin/X on my desktop machine to hopefully be
able to pull up jvisualvm remotely and/or just use standalone version.
Perhaps Cygwin/X would also
On 20/10/2010 20:20, Jason Britton wrote:
commons-dbcp-1.2.1.jar
and
commons-pool-1.3.jar
Lots of sync related fixes since then. I'd strongly recommend and upgrade.
Mark
-
To unsubscribe, e-mail:
Hi Martin,
In researching my jstack not working issue I too came across the make sure
you run jstack as the same user that tomcat is running as. So I did try
su'ing to my tomcat user and issuing the jstack -F -l -m pid command to no
avail. After I reproduce my application deadlock again this
Jason Britton wrote:
Hi Martin,
In researching my jstack not working issue I too came across the make sure
you run jstack as the same user that tomcat is running as. So I did try
su'ing to my tomcat user and issuing the jstack -F -l -m pid command to no
avail. After I reproduce my application
I have a tomcat instance hanging up (and currently still hung up) and would
really appreciate pointers on how to debug further.
A belated thanks to Konstantin for the info on kill -QUIT pid to retrieve
thread dumps But I was only able to pull thread dumps on the hung process
using jvisualvm.
On 20/10/2010 21:37, Jason Britton wrote:
I have a tomcat instance hanging up (and currently still hung up) and would
really appreciate pointers on how to debug further.
A belated thanks to Konstantin for the info on kill -QUIT pid to retrieve
thread dumps But I was only able to pull thread
On 10/20/10 7:11 PM, Jason Britton wrote:
Thankfully when I pulled up jvisualvm on the server and issued thread dumps,
even though the stacktraces for the threads did not come up within jvisualvm
the thread stacktraces were dumped to stdout. So I did get thread
stacktraces in my tomcat log.
commons-dbcp-1.2.1.jar
and
commons-pool-1.3.jar
I have a connection handler class that I wrote around a static instance of
SharedPoolDataSource. SharedPoolDataSource gets initialized in static
block. Locking shown in stacktrace is occurring within
aSharedPoolDataSource.getConnection() call.
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