gmane.comp.jakarta.tomcat.user

Re: tomcat slowing down

Warren Bell — 2012-05-16T22:44:52

Here is a good link explaining some of the pros and cons of Wicket. Look
at the part titled "Wicket Session size!"

http://www.small-improvements.com/10-things-about-apache-wicket-i-love

Thanks,

Warren Bell

On 5/16/12 12:49 PM, Mikolaj Rydzewski wrote:

Re: tomcat slowing down

Warren Bell — 2012-05-16T22:38:19

A Wicket app that is not written correctly can suck up resources. Wicket
keeps track of pages a user has been on by serializing them, "back
button support". If a page has references to other objects, it
serializes them and so on and so on. It can get real ugly real quick.

Wicket has many built-in ways to keep this from happening, but it is
still easy for a beginner to write an app that can cause problems.

Thanks,

Warren Bell

On 5/16/12 12:49 PM, Mikolaj Rydzewski wrote:

Fwd: Tomcat 7.0.27 websocket cluster

Ronaldo Rigoni ... — 2012-05-16T19:52:08

Hello,
And, are the websocket clustering planned for future releases?


Regards

[]'s,
Ronaldo Rigoni
Arquiteto de Software



---------- Forwarded message ----------
From: Mark Thomas <markt< at >apache.org>
Date: Wed, May 16, 2012 at 3:44 PM
Subject: Re: Tomcat 7.0.27 websocket cluster
To: Tomcat Users List <users< at >tomcat.apache.org>


On 16/05/2012 19:34, Ronaldo Rigoni ... wrote:
to.

It is a protocol switch - as per RFC6455. It starts off as an HTTP
connection and then switches to WebSocket.

Since it is a permanent connection, with objects representing the
connection at both ends, the initial expectation is that state can be
maintained in that object (you have to implement it, extending a base
class Tomcat provides).

If you need more, let us know with a use case. I am on the J2EE
WebSocket EG and we are looking at this topic at the moment.

Mark

client


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Re: tomcat slowing down

Mikolaj Rydzewski — 2012-05-16T19:49:11

So there are two different applications? Myfaces (which used to work for 
a long time) and wicket (which takes server down)?
I'd separate them first to have clear environment for investigation. 
Then enable GC logging, attach jvisualvm, deploy psi probe 
(http://code.google.com/p/psi-probe/), etc.

Re: Tomcat 7.0.27 websocket cluster

Mark Thomas — 2012-05-16T18:44:14

It is a protocol switch - as per RFC6455. It starts off as an HTTP
connection and then switches to WebSocket.

Since it is a permanent connection, with objects representing the
connection at both ends, the initial expectation is that state can be
maintained in that object (you have to implement it, extending a base
class Tomcat provides).

If you need more, let us know with a use case. I am on the J2EE
WebSocket EG and we are looking at this topic at the moment.

Mark

Re: Tomcat 7.0.27 websocket cluster

Ronaldo Rigoni ... — 2012-05-16T18:34:36

Thanks Peter and Mark!

The current implementation is a tunnel over http or another socket open?
I'm planning to port a webgame to tomcat, comunicationg with websockets.
But, the absence of a session or context turns a little bit hard to work to.

Many thanks.
[]'s,
Ronaldo Rigoni
Arquiteto de Software



On Wed, May 16, 2012 at 3:26 PM, Peter Roßbach <pr< at >objektpark.de> wrote:

Re: Tomcat 7.0.27 websocket cluster

Peter Roßbach — 2012-05-16T18:26:59

Currently we don't support it, but I read the Websocket spec that a client can send Auth and Cookie header!

Peter

Am 16.05.2012 um 20:21 schrieb Mark Thomas:

Re: Tomcat 7.0.27 websocket cluster

Mark Thomas — 2012-05-16T18:21:19

There would be little point since at present there is no way to access
the HTTP session from the WebSocket connection.

Mark

Re: Tomcat dies suddenly

Carl Kabbe — 2012-05-16T18:16:33

Interesting and thanks for your response.

We switched back to VM version 1.6.0_07 (64 bit on Slackware) and everything was fine.  For several unrelated reasons, we switched to Tomcat version 6.0.35 and JVM (Oracle) version 1.6.0_16 and all has been fine for a month or so.    The cause remains unknown but seemingly gone now.

Thanks,

Carl


On May 16, 2012, at 1:53 PM, slayer12 wrote:

Re: Tomcat dies suddenly

slayer12 — 2012-05-16T17:53:12

I was facing a problem with similar symptoms - Tomcat 7 (on centos 5, 64 bit,
12 GB RAM) was crashing without anything being logged in catalina.out
In case of JVM crash, there is supposed to be some hs_err_pid.log file but
that was also not getting generated.
Neither were there any OutOfMemory messages in /var/log/messages

Turns out that my code was going into an infinite loop because I was using
Calendar.before(Date) and this method (from java.util.calandar) stupidly
takes any object as a parameter but returns false if the passed object is
anything other than and instance of Calendar.

Sun knows about this, but in their infinite wisdom had closed 2 java bugs
related to this without resolving anything !!
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4682471
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4738710

- just my 2 bits

--
View this message in context: http://tomcat.10.n6.nabble.com/Tomcat-dies-suddenly-tp2136492p4980853.html
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Re: [OT] tomcat slowing down

André Warnier — 2012-05-16T17:38:21

Well exactly.  The only familiarity I previously had with the word "wicket", was as some 
bit of wood carefully balanced on top of two other bits of wood, with some white-attired 
gentleman armed with another (wider) piece of wood in front, seemingly very anxious not to 
let another bloke viciously toss the first bit of wood off the second ones by means of 
something looking like a bigger golf ball.  And of course as a term in the mysterious kind 
of point-scoring ritual that goes with the same, along with other keywords like "inning", 
"not outs" and such.

So, in my mind - before I consulted Wikipedia - I had this picture of some kind of graphic 
browser applet, mostly popular in the UK and Indian markets, which one could use to 
superimpose the lastest results of such games worldwide upon one's professional workspace, 
with real-time updates.
But then, from previous experience watching the game on TV, I still could not quite figure 
out how even the real-time updates of 10 simultaneous tournaments for te

Tomcat 7.0.27 websocket cluster

Ronaldo Rigoni ... — 2012-05-16T17:31:53

Hello all,
I've a little question about the websocket implementation available in
Apache Tomcat 7.0.27.
There is a way to cluster an websocket application working with a session
replication feature?

Thanks
[]'s,
Ronaldo Rigoni

RE: [OT] tomcat slowing down

Caldarale, Charles R — 2012-05-16T17:29:45



Howzat?

 - Chuck


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Re: [OT] tomcat slowing down

Pid — 2012-05-16T17:16:03

That sir, is because you are not an Englishman.  However, I can assure
you, that we are very familiar with the wicket.  What ho'!


p

Re: [OT] tomcat slowing down

André Warnier — 2012-05-16T17:01:19

I was looking at "Wicket" in Wikipedia, and although much of that is unfamiliar to me, it 
sounds like there might indeed be DHTML and Ajax components involved.
Now I also can't imagine that someone would release an application that brings a server 
down to its knees with 10 users, but maybe some misconfiguration can achieve that.

Re: [OT] tomcat slowing down

Christopher Schultz — 2012-05-16T16:39:32

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André,

On 5/16/12 11:43 AM, André Warnier wrote:

There are libraries that make accepting Ajax requests easier (e.g.
parsing XML, unpacking JSON objects, etc.). So one could call this
"Ajax support" I suppose.

- -chris
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Re: Fwd: mod_jk binary 1.2.36 Apache 2.4 Win32/Win64

Christopher Schultz — 2012-05-16T16:37:42

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All,

Adjusting the subject for better searchability in the archives.

Also adding a link: http://www.apachelounge.com/download/

- -chris

On 5/16/12 11:52 AM, chris derham wrote:
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Re: Multiple tomcat Instances on Same Server and One Apache Instance

Pid — 2012-05-16T16:25:42

Exactly as you say:

 /v1/appname
 /v2/appname

Of course that's not what the OP asked for, as you also said.


p

Re: tomcat slowing down

Pid — 2012-05-16T16:24:08

Apache Wicket, app framework.

I'm given to understand that it stores a lot of data in the session, so
having a look at GC, heap usage properly seems like a good idea.

The OPs numbers didn't add up for me, maybe he can clarify...


24Gb?


& now only 2Gb?


p

RE: [OT] tomcat slowing down

Caldarale, Charles R — 2012-05-16T16:04:22


It may be so in this case as well - the stack traces include use of HttpClient, so the webapp may actually be hung up waiting on some external resource.

 - Chuck


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Fwd: mod_jk binary

chris derham — 2012-05-16T15:52:22

Steffen from apache lounge asked me to forward this to tomcat mailing list

Chris

---------- Forwarded message ----------
From: Steffen <info< at >apachelounge.com>
Date: Wed, May 16, 2012 at 12:10 PM
Subject: Re: mod_jk binary

  Chris,

Made 1.2.36 Apache 2.4 Win32/Win64 available.
Maybe you can say it on the Tomcat user list.

Steffen