André,
On Wed, Mar 18, 2009 at 7:37 PM, André Warnier a...@ice-sa.com wrote:
Nope, just that after people keep throwing mysterious acronyms at me, and
several of them start to use the same ones, I get curious.
Since I believe one of those people was me, I hope throwing stuff at
you didn't
I think I've waited long enough with these.
Pointers to JMX and RMI, please ?
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From: André Warnier [mailto:a...@ice-sa.com]
Subject: Tomcat for dummies, subtopic Acronyms
Pointers to JMX and RMI, please ?
http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/
http://java.sun.com/javase/technologies/core/basic/rmi/index.jsp
Those are the starting
Caldarale, Charles R wrote:
From: André Warnier [mailto:a...@ice-sa.com]
Subject: Tomcat for dummies, subtopic Acronyms
Pointers to JMX and RMI, please ?
http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/
http://java.sun.com/javase/technologies/core/basic/rmi/index.jsp
Thanks André, my favorite thread ever.
I got so much more from this then reading the spec.
Don
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To the people who have indicated their appreciation for the thread so
far : I may have provided the pretext and the questions, but the answers
were not mine. So don't forget Mark and Chuck and Chris and Peter and
Ken and others. They are the non-dummies who wrote the intelligent stuff.
Since
From: Ken Bowen [mailto:kbo...@als.com]
Subject: Re: Tomcat for Dummies
I believe (but do not know -- Chuck, Mark??) that Tomcat essentially
creates a (new or recycled) thread in which to run contextDestroyed .
Looks like it's actually the thread that processes the request for the Tomcat
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André,
On 3/11/2009 6:33 AM, André Warnier wrote:
And if it asks to undeploy itself, is it not like pulling the carpet
from under its own feet?
It's more like asking a parent to pull the rug, but, yes, that's
basically what you're doing.
I mean,
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André,
I think it will help to give you perl analogies to everything. Here goes.
On 3/11/2009 6:00 AM, André Warnier wrote:
- we have a JVM
This is the 'perl' binary.
- inside the JVM, we have a Tomcat
This is the perl script you're executing.
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: Tomcat for Dummies
You can even restart the manager app
Nit picking: probably not. It looks like the manager app does all the work of
starting and stopping other webapps, so there doesn't appear to be any threads
Hi. I hadn't had a chance yet to thank the various people here for
having the patience and persistence to explain to this dummy what must
be rather evident to experts.
I do so now, profusely.
It was very informative and rather clear.
I also gather that some of the details were not necessarily so
Christopher Schultz wrote:
Er... does that help?
Yes, a lot. It even answers a large part of the question I just posted
again.
I just don't like your disparaging tone about perl.
You know, we perl guys can also do threads, just as we can also do OO
stuff. We can also do strict; we can even
[I seem to be getting very delayed emails from the list; if this has already
been answered, ignore me!]
From: André Warnier [mailto:a...@ice-sa.com]
suppose there are 3 active
servlets (processing requests) at the moment the request to
undeploy is
issued by one of them. The servlet issuing
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André,
On 3/13/2009 12:04 PM, André Warnier wrote:
As a consequence, Tomcat no longer accepts new requests for that
webapp, and starts the process of stopping it and undeploying it. If
the webapp defined a ServletContextListener, this thing 's
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Chuck,
On 3/13/2009 11:34 AM, Caldarale, Charles R wrote:
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: Tomcat for Dummies
You can even restart the manager app
Nit picking: probably not. It looks like
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André,
On 3/13/2009 12:05 PM, André Warnier wrote:
I just don't like your disparaging tone about perl.
Oh, sorry. I wasn't trying to be negative. Actually, I quite like Perl.
I'm always the one who gets beat up (verbally) at geek parties when
Interestingthanks Chuck
Ken
On Mar 13, 2009, at 10:33 AM, Caldarale, Charles R wrote:
From: Ken Bowen [mailto:kbo...@als.com]
Subject: Re: Tomcat for Dummies
I believe (but do not know -- Chuck, Mark??) that Tomcat essentially
creates a (new or recycled) thread in which to run
From: Peter Crowther [mailto:peter.crowt...@melandra.com]
Subject: RE: Tomcat for Dummies
Or does one have to implement in each servlet some
kind of callback routine that the ContextDestroy can call ?
That works too.
Not really. From the API spec for contextDestroyed():
All servlets
Christopher Schultz wrote:
Oh, sorry.
As you certainly surmised, I wasn't being serious, and was in fact
fishing for some reaction.
Perl is a write-only language
(meaning that nobody can ever read a perl script after the fact).
I like that one.
Let me offer another one, popular in perl
Caldarale, Charles R wrote:
From: Peter Crowther [mailto:peter.crowt...@melandra.com]
Subject: RE: Tomcat for Dummies
Or does one have to implement in each servlet some
kind of callback routine that the ContextDestroy can call ?
That works too.
Not really. From the API spec
André Warnier wrote:
Caldarale, Charles R wrote:
From: Peter Crowther [mailto:peter.crowt...@melandra.com] Subject:
RE: Tomcat for Dummies
Or does one have to implement in each servlet some
kind of callback routine that the ContextDestroy can call ?
That works too.
Not really. From
From: André Warnier [mailto:a...@ice-sa.com]
Subject: Re: Tomcat for Dummies
Now, do I understand this wrong
You do understand it wrong.
the running servlets
A servlet doesn't run; threads run, executing code in servlets.
are not being notified in any way that the application
@tomcat.apache.org
Subject: Re: Tomcat for Dummies
Hi. I hadn't had a chance yet to thank the various people here for
having the patience and persistence to explain to this dummy what must
be rather evident to experts.
I do so now, profusely.
It was very informative and rather clear.
I also gather that some
Edward Bicker wrote:
This is a Fantastic request for Info. I am relieved to know there are some folks that can still frame a question in such a way to be a pleasure to read.
Thanks,
Ed
Obviously the answerers agree; look at how much more detailed and useful
the responses are!! Some of
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André,
On 3/13/2009 1:25 PM, André Warnier wrote:
But for instance the following kind of snippet, while undoubtedly
looking simple and elegant to any confirmed Java servlet programmer, in
the eyes of this beholder is not any better :
Hi.
As part of the beginners rubrique, I have a question which will
undoubtedly show the depth of my lack of knowledge of things Java and
Tomcat. But maybe there will be a sympathetic soul here.
Since I am still missing much of the underlying knowledge, I would beg
that whoever answers does
André Warnier wrote:
- we have a JVM. That is the real process that is running, at the OS
level. That process can be killed, or decide to stop running, at which
point we don't have a JVM process anymore, and thus no Tomcat and no
webapps at all. That's kind of drastic and definitive.
Yes.
Mark Thomas wrote:
André Warnier wrote:
Now comes the basic question : can a webapp stop itself, without taking
the whole Tomcat and JVM with it ? In other words, in response to
something (a variable being a certain value, or the interception of some
event or whatever), can my webapp decide to
From: André Warnier [mailto:a...@ice-sa.com]
Subject: Re: Tomcat for Dummies
If I am not abusing, how does it do that, schematically ?
I presume it has a more direct way than to itself isue a
HTTP request to the Manager webapp with the appropriate
parameters ?
No, the HTTP request would
Caldarale, Charles R wrote:
[...]
That should be handled by a ServletContextListener declared in WEB-INF/web.xml,
which will be invoked before the deletion of the webapp's files.
At the risk of sounding heretical and tasteless on this forum, I must
admit that this whole Java and Tomcat
Caldarale, Charles R wrote:
From: André Warnier [mailto:a...@ice-sa.com]
Subject: Re: Tomcat for Dummies
If I am not abusing, how does it do that, schematically ?
I presume it has a more direct way than to itself isue a
HTTP request to the Manager webapp with the appropriate
parameters
From: André Warnier [mailto:a...@ice-sa.com]
Caldarale, Charles R wrote:
That should be handled by a ServletContextListener declared
in WEB-INF/web.xml, which will be invoked before the deletion
of the webapp's files.
More seriously thus, there seems to be a problem with this logic :
, nothing will happens to
myapp2 -- it is totally physically distinct from myapp1.
Ergo Watson, we've solved the morning star/evening star paradox.
--Ken
On Mar 11, 2009, at 10:39 AM, André Warnier wrote:
Caldarale, Charles R wrote:
From: André Warnier [mailto:a...@ice-sa.com] Subject: Re: Tomcat
Ken Bowen wrote:
Let's be frugal and use just 2 instances of a webapp.
How do you run 2 instances of a webapp?
You must deploy them. How do you do that?
You drop a war file for each into webapps.
.. etc.. (sound of me being whacked ..)
Sorry, I expressed myself badly I guess.
I meant :
-
From: André Warnier [mailto:a...@ice-sa.com]
Now, how many of these ServletContextListener things are in
existence,
Exactly as many as you have defined in web.xml. Probably one, as you probably
wouldn't want to define more than that - I'm not even sure whether the spec
allows it.
and how
From: André Warnier [mailto:a...@ice-sa.com]
Subject: Re: Tomcat for Dummies
Now, how many of these ServletContextListener things
are in existence, and how many are being called to say
that something is going on ?
Read the servlet spec (section 10). The number in existence
.. etc.. (sound of me being whacked ..)
no, nono domestic violence here :-)
It's often hard enough to understand face to face, much less across
5000+ miles.
I think the following is a fair description Chuck others should
nail me if it's not.
A webapp can be made up of one or
From: Ken Bowen [mailto:kbo...@als.com]
Subject: Re: Tomcat for Dummies
Also, each thread could easily generate other
child threads to run
Only if the webapp chooses to do so; that's not something Tomcat does.
But after that interval, it invokes contextDestroyed
/just once/
That's
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