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Posted to users@wicket.apache.org by LucHub <lu...@luchub.com> on 2011/01/04 19:38:23 UTC
Wicket web site down with a few hits
Hi all,
I recently created a wicket 1.4.12 web site and I deployed it on Apache
Tomcat 7 on Ubuntu Server. What happen is that if I hit quickly 2 different
links on the menu the web site sometime goes down. I cannot access the
website also from other computers.
Very basic configuration on the web.xml, with only the filter set.
The server is an AWS micro instance, normally I have at least 100 MB of free
memory and a very low CPU consuption.
There is any special setting for deployment of a wicket web applicaiton?
Thanks.
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Re: Wicket web site down with a few hits
Posted by LucHub <lu...@luchub.com>.
Hi, thanks for the reply.
Honestly I read a little bit around and using WicketServlet instead of
wicketFilter is a kind of not reccomended. I would like to go for teh filter
way, but thanks a lot for teh reply.
Part of the reason is that I think that is impossible that a wicket app goes
down because of 20 hits close each other. I'm wrong somewhere and I need you
help gurus :-)
If you need any other information please ask.
Luca
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Re: Wicket web site down with a few hits
Posted by MZ...@osc.state.ny.us.
Just a hunch....try WicketServlet instead of WicketFilter (in web.xml)...
From: LucHub <lu...@luchub.com>
To: users@wicket.apache.org
Date: 01/04/2011 03:26 PM
Subject: Re: Wicket web site down with a few hits
Hi, thank you for the fast reply,
Nothing strange from tomcat logs, also the server is not out of CPU or
memory.
I still have to enable wicket logs and check with a non Hibernate app (i
omitted I'm using Hibernate)
I'll post. Thanks again
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Re: Wicket web site down with a few hits
Posted by Martijn Dashorst <ma...@gmail.com>.
c3p0 and other connection pools are pretty much deprecated with
hibernate 3.6 (as we discovered). com.jolbox.bonecp is a competent
replacement.
Martijn
On Fri, Jan 7, 2011 at 11:42 AM, LucHub <lu...@luchub.com> wrote:
>
> Hi Martin,
>
> thanks for you suggestion. I'll make more test in this direction. Right know
> I temporaly solved the problem avoiding the use of the c3p0 library and
> having a thread that every hour keep the connection awake. Of course I'll do
> test to optimize the app based on your suggestion.
> Thanks a lot for all your precious help.
>
>
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Re: Wicket web site down with a few hits
Posted by nino martinez wael <ni...@gmail.com>.
Did you make sure that when using c3p0 it actually was enabled and that you
used the validation query? and set this property:
http://stackoverflow.com/questions/1652676/hibernate-c3p0-broken-pipe
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
Anyways as Martin says BoneCP are nicer, although some time ago it did not
play that nice together with HSQL (it's probably better now)..
2011/1/7 LucHub <lu...@luchub.com>
>
> Hi Martin,
>
> thanks for you suggestion. I'll make more test in this direction. Right
> know
> I temporaly solved the problem avoiding the use of the c3p0 library and
> having a thread that every hour keep the connection awake. Of course I'll
> do
> test to optimize the app based on your suggestion.
> Thanks a lot for all your precious help.
>
>
> --
> View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/Wicket-web-site-down-with-a-few-hits-tp3174117p3178918.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
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> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
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>
>
Re: Wicket web site down with a few hits
Posted by LucHub <lu...@luchub.com>.
Hi Martin,
thanks for you suggestion. I'll make more test in this direction. Right know
I temporaly solved the problem avoiding the use of the c3p0 library and
having a thread that every hour keep the connection awake. Of course I'll do
test to optimize the app based on your suggestion.
Thanks a lot for all your precious help.
--
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Re: Wicket web site down with a few hits
Posted by Martin Grigorov <mg...@apache.org>.
it sounds like you were leaking DB connections
Thread dump easily will show you this problem. You'll see threads trying to
acquire a DB connection and will wait until some of the previous acquired
connections is returned to the pool.
On Thu, Jan 6, 2011 at 12:27 PM, LucHub <lu...@luchub.com> wrote:
>
> Hi, I tried to kill the process but I found nothing of strange. Right now I
> think that the problem is probably solved. I throw away a library that I
> used together with Hibernate (the c3p0 library) that I put ther essentially
> for autoReconnection problems of the JDBC mysql driver. Avoiding this
> library, the app seems to pass the load stress test.
>
> More info as I make more test.
>
> Thanks to all.
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Re: Wicket web site down with a few hits
Posted by LucHub <lu...@luchub.com>.
Hi, I tried to kill the process but I found nothing of strange. Right now I
think that the problem is probably solved. I throw away a library that I
used together with Hibernate (the c3p0 library) that I put ther essentially
for autoReconnection problems of the JDBC mysql driver. Avoiding this
library, the app seems to pass the load stress test.
More info as I make more test.
Thanks to all.
--
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Re: Wicket web site down with a few hits
Posted by Martin Grigorov <mg...@apache.org>.
If you use some kind of Unix then run: kill -3 <process id of
tomcat/jetty/...)
This will dump the threads' stack traces in the process standard out
(somewhere in the log files).
This way you can see whether there are threads waiting for something.
Making 20 requests and stopping responding could mean that your
application/setup leaks connections and
at some point the web server stops responding to new clients.
On Wed, Jan 5, 2011 at 10:41 AM, LucHub <lu...@luchub.com> wrote:
>
> Hi Martin,
>
> What do you exactly mean for dump the threads? I am almost a newbie, I
> cannot find any document that examplin this.
>
> I made a few more test logging Wicket. To have the web site going down I
> need a few hits (close each other) on a bookmarkablepagelink.
>
> Here ( http://www.luchub.com/temp/info.txt
> http://www.luchub.com/temp/info.txt ) is the log at the INFO level just as
> an example.
>
>
> After this, any other hit of the link doesn't produce any row.
>
> Here I link a debug level log of a 'pretty much the same' situation (
> http://www.luchub.com/temp/example.txt
> http://www.luchub.com/temp/example.txt )
>
> Thanks in advance
> --
> View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/Wicket-web-site-down-with-a-few-hits-tp3174117p3175105.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
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Re: Wicket web site down with a few hits
Posted by LucHub <lu...@luchub.com>.
Hi Martin,
What do you exactly mean for dump the threads? I am almost a newbie, I
cannot find any document that examplin this.
I made a few more test logging Wicket. To have the web site going down I
need a few hits (close each other) on a bookmarkablepagelink.
Here ( http://www.luchub.com/temp/info.txt
http://www.luchub.com/temp/info.txt ) is the log at the INFO level just as
an example.
After this, any other hit of the link doesn't produce any row.
Here I link a debug level log of a 'pretty much the same' situation (
http://www.luchub.com/temp/example.txt
http://www.luchub.com/temp/example.txt )
Thanks in advance
--
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Re: Wicket web site down with a few hits
Posted by Martin Grigorov <mg...@apache.org>.
dump the threads
maybe there is a deadlock
On Tue, Jan 4, 2011 at 9:25 PM, LucHub <lu...@luchub.com> wrote:
>
> Hi, thank you for the fast reply,
>
> Nothing strange from tomcat logs, also the server is not out of CPU or
> memory.
>
> I still have to enable wicket logs and check with a non Hibernate app (i
> omitted I'm using Hibernate)
>
> I'll post. Thanks again
> --
> View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/Wicket-web-site-down-with-a-few-hits-tp3174117p3174316.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
Re: Wicket web site down with a few hits
Posted by LucHub <lu...@luchub.com>.
Hi, thank you for the fast reply,
Nothing strange from tomcat logs, also the server is not out of CPU or
memory.
I still have to enable wicket logs and check with a non Hibernate app (i
omitted I'm using Hibernate)
I'll post. Thanks again
--
View this message in context: http://apache-wicket.1842946.n4.nabble.com/Wicket-web-site-down-with-a-few-hits-tp3174117p3174316.html
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Re: Wicket web site down with a few hits
Posted by Martin Grigorov <mg...@apache.org>.
Any indications what exactly is the problem ?
Anything in the logs? Any jvm crashes?
On Tue, Jan 4, 2011 at 7:38 PM, LucHub <lu...@luchub.com> wrote:
>
> Hi all,
>
> I recently created a wicket 1.4.12 web site and I deployed it on Apache
> Tomcat 7 on Ubuntu Server. What happen is that if I hit quickly 2 different
> links on the menu the web site sometime goes down. I cannot access the
> website also from other computers.
>
> Very basic configuration on the web.xml, with only the filter set.
>
> The server is an AWS micro instance, normally I have at least 100 MB of
> free
> memory and a very low CPU consuption.
>
> There is any special setting for deployment of a wicket web applicaiton?
>
> Thanks.
> --
> View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/Wicket-web-site-down-with-a-few-hits-tp3174117p3174117.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
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>
>