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Posted to users@tomcat.apache.org by Roland Carlsson <ro...@alfa-moving.se> on 2005/03/17 08:32:54 UTC

Reload webapp and context

Hi!

I have a problem with an webapp with deploying webapps. The problem is the
contextfile that since my development environment differs a little to my
deployment environment have to be edited a little after deployment. But how
do I force tomcat to re-load the context? Right now the only way I know
about is to reboot tomcat witch leads to a full stop of all my web-apps
instead of only one witch in turn leads to more complaints from my users.

So, is there a way to force reload of the context when reloading the
web-app?

Thanks in advance
Roland Carlsson


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Re: SV: Reload webapp and context

Posted by QM <qm...@brandxdev.net>.
On Thu, Mar 17, 2005 at 02:12:06PM +0100, Roland Carlsson wrote:
: Do I read you correctly that there are no solution but to restart Tomcat to
: reload the context completly?

That's not at all what I said.  I can't provide an authoritative answer
to that question as I didn't write Tomcat. ;)

With that in mind, context isoliation and scheduled maintenance/downtime
windows are fairly standard practices in the J2EE realm.  While they
don't directly address your concern of completely reloading a context,
they tangentially address your desire to start and stop Tomcat whenever
you please.

-QM

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Re: SV: Reload webapp and context

Posted by Lionel Farbos <li...@free.fr>.
On Thu, 17 Mar 2005 14:12:06 +0100
Roland Carlsson <ro...@alfa-moving.se> wrote:

> Hi and thanks for your answer!
> 
> Do I read you correctly that there are no solution but to restart Tomcat to
> reload the context completly?
> 
False.

> Lionel, the manager doesn't seem to re-read the context file under
> /conf/Catalina/mydomain/myapp.xml and that is the one I have have to change.

If you try a reload, or stop then start, effectively no change :-(
but if you try undeploy then deploy : it works :-))

so, it is possible without restarting entirely tomcat 
> 
> Thanks in advance
> Roland Carlsson
> 
> 
> Den 05-03-17 13.58, skrev "QM" <qm...@brandxdev.net>:
> 
> > On Thu, Mar 17, 2005 at 08:32:54AM +0100, Roland Carlsson wrote:
> > : do I force tomcat to re-load the context? Right now the only way I know
> > : about is to reboot tomcat witch leads to a full stop of all my web-apps
> > : instead of only one witch in turn leads to more complaints from my users.
> > 
> > Perhaps a non-technical solution would help:
> > 
> > 1/ schedule regular deployment times.  Apps expect downtime during these
> > windows, and you're free to start/stop at will.
> > 
> > 2/ Put each app in its own JVM.  Such isolation solves several
> > headaches, not the least of which is the ability for each app to choose
> > its own downtime window.
> > 
> > -QM
> > 
> 
> 
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SV: Reload webapp and context

Posted by Roland Carlsson <ro...@alfa-moving.se>.
Hi and thanks for your answer!

Do I read you correctly that there are no solution but to restart Tomcat to
reload the context completly?

Lionel, the manager doesn't seem to re-read the context file under
/conf/Catalina/mydomain/myapp.xml and that is the one I have have to change.

Thanks in advance
Roland Carlsson


Den 05-03-17 13.58, skrev "QM" <qm...@brandxdev.net>:

> On Thu, Mar 17, 2005 at 08:32:54AM +0100, Roland Carlsson wrote:
> : do I force tomcat to re-load the context? Right now the only way I know
> : about is to reboot tomcat witch leads to a full stop of all my web-apps
> : instead of only one witch in turn leads to more complaints from my users.
> 
> Perhaps a non-technical solution would help:
> 
> 1/ schedule regular deployment times.  Apps expect downtime during these
> windows, and you're free to start/stop at will.
> 
> 2/ Put each app in its own JVM.  Such isolation solves several
> headaches, not the least of which is the ability for each app to choose
> its own downtime window.
> 
> -QM
> 


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Re: Reload webapp and context

Posted by QM <qm...@brandxdev.net>.
On Thu, Mar 17, 2005 at 08:32:54AM +0100, Roland Carlsson wrote:
: do I force tomcat to re-load the context? Right now the only way I know
: about is to reboot tomcat witch leads to a full stop of all my web-apps
: instead of only one witch in turn leads to more complaints from my users.

Perhaps a non-technical solution would help:

1/ schedule regular deployment times.  Apps expect downtime during these
windows, and you're free to start/stop at will.

2/ Put each app in its own JVM.  Such isolation solves several
headaches, not the least of which is the ability for each app to choose
its own downtime window.

-QM


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Re: Reload webapp and context

Posted by Bernard <bh...@actrix.gen.nz>.
Hi,

Maybe this can help:

In Tomcat 5.5, the file context.xml in the server's conf directory
allows for watched resources, which when touched, cause an application
reload:

It looks like this:

<!-- The contents of this file will be loaded for each web application
-->
<Context>

    <!-- Default set of monitored resources -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>META-INF/context.xml</WatchedResource>
    
    <!-- Uncomment this to disable session persistence across Tomcat
restarts -->
    <!--
    <Manager pathname="" />
    -->
    
</Context>

I am trying to not include the manager application in a production
system because of the additional security risk.

Regards,
Bernard


On Thu, 17 Mar 2005 11:02:57 +0100, you wrote:

>Hi,
>
>To reload, start, stop, deploy, undeploy contexts see the Manager :
>http://jakarta.apache.org/tomcat/tomcat-5.5-doc/manager-howto.html
>
>I don't know your tomcat version, but it works since TC 4.
>
>Cheers.
>
>On Thu, 17 Mar 2005 08:32:54 +0100
>Roland Carlsson <ro...@alfa-moving.se> wrote:
>
>> Hi!
>> 
>> I have a problem with an webapp with deploying webapps. The problem is the
>> contextfile that since my development environment differs a little to my
>> deployment environment have to be edited a little after deployment. But how
>> do I force tomcat to re-load the context? Right now the only way I know
>> about is to reboot tomcat witch leads to a full stop of all my web-apps
>> instead of only one witch in turn leads to more complaints from my users.
>> 
>> So, is there a way to force reload of the context when reloading the
>> web-app?
>> 
>> Thanks in advance
>> Roland Carlsson
>> 
>> 
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>> For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>> 
>> 
>
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General Basic Deployment Question

Posted by Bernard <bh...@actrix.gen.nz>.
Hi,

I want to deploy a servlet jar file without using the manager
application.

From reading context.xml, I understand that is possible to re-start an
application by modifying the files that are listed in it e.g. 

<WatchedResource>WEB-INF/web.xml</WatchedResource>

But it doesn't work for me. How can I get it to work?
Has anybody seen this working at all?

With the jserv servlet engine, I only had to touch any file in the
list of the servlet repositories and the servlet zone was re-started.

My requirements are minimal, fully satisfied by the old jserv.


Many thanks,

Bernard

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Re: Reload webapp and context

Posted by Torrey Rice <ri...@sitepen.com>.
Thank you for your suggestions. I will give them a shot. It's even 
stranger when you set the server to not unpack wars. You might find it 
interesting so I'll give you a brief description of what I found in my 
tests to get tomcat to redeploy without a restart.

Let's say I have a war called com_mysite_www.war. I set tomcat up so 
that it does auto-deploy but it doesn't unpack the wars. I also set 
com_mysite_www as the default app. I deploy the war file (by copying it 
into the webapps dir or using the manager app) and tomcat behind the 
scenes unpacks it to it's work directory (as it would be terribly 
inefficient to unpack it every time a request was made). Then go back to 
manager app and undeploy it (or just manually delete the file .war out 
of the webapps dir).. now hit localhost:8080... the .war is gone but 
your site remains. That isn't surprising but what happens next is. Now 
change something, make a new .war and deploy it. When you hit 
localhost:8080 you will still see the old content however if you hit 
localhost:8080/com_mysite_www/ you will see the new content. The only 
way to get it to reflect the changes when you hit the root is to restart 
tomcat. I have tried everything I can think of and read through many 
postings, tomcat books and the tomcat site but I can find no solution 
for this other than a server restart.

It's odd stuff and I'd love to find out if others have experienced this 
and how they deal with it. Personally on my dev machine I do it the 
brute force method.. I have an ant script that bulids my .war, deletes 
the old content out of the webapps dir and then deploys the new one for 
me. I can't do this on the live server though but it does work as 
intended which is more than I can say for the suggested methods of 
redeploying a .war in the tomcat docs. :)

Thinking about your suggestions, I wonder if I were to copy in my new 
.war and then go to the deployed directory and remove the web.xml if it 
would choke on that and try to fix the problem by redeploying from the 
war which in this case would be updated. Still an ugly hack of a work 
around but it would limit the downtime to just that one app and it'd be 
less of a downtime than restarting the server.

-Torrey

Bernard wrote:

>Hi Torrey,
>
>I can't comment on .war file deployment directly because I am not
>using it. But I want to help you anyway, suggesting the approach I
>would take.
>
>I would forget manager for a moment. A basic servlet engine (these
>things have been around for 10 years or more, remember Sun's Java
>Server) are capable to reload servlets if any of the watched resources
>change.
>
>Server restart for your purpose is a very sad state of affairs, not
>acceptable by today's standards.
>
>So I would try to touch any of the watched resources, e.g. a servlet
>class file, a servlet jar file or the web.xml file.
>
>That, from my experience with old mod_jserv, does not immediately
>trigger class re-loading. Only the next servlet request provides the
>event for that (noticable delay of servlet response).
>
>If that does not work, then you have the most basic problem. If it
>works, then you have a feeling for how it should work. Then work your
>way up to war file deplayment with manager.
>I would think that you don't need manager for most management tasks
>e.g. war file deployment because who can assume that you want to
>introduce a security risk by providing such powerful access to your
>application via http???
>
>Playing around a little is sometimes very useful.
>
>Regards,
>
>Bernard
>
>On Thu, 17 Mar 2005 18:50:40 -0800, you wrote:
>
>  
>
>>I have a similar problem in 5.5 when deploying my .war files. If I go to 
>>the manager and undeploy a webapp that was deployed from a war it only 
>>deletes the .war file and not the exploded directory. If I want to 
>>deploy an update I have to stop tomcat and start it again for it to 
>>pickup the change in the war file. Even when I have auto-deploy set to 
>>true.
>>
>>I have done everything I can think of but it seems that to make an 
>>update like this in Tomcat you have to stop and restart which is really 
>>unfortunate.
>>
>>Bernard wrote:
>>
>>    
>>
>>>Roland,
>>>
>>>You might want to add yourself to the cc list of this bug:
>>>
>>>Normal startup causes server error 500
>>>   http://issues.apache.org/bugzilla/show_bug.cgi?id=34050
>>>
>>>It might be in the area of your interest.
>>>
>>>Regards,
>>>
>>>Bernard
>>>
>>>
>>>On Thu, 17 Mar 2005 11:02:57 +0100, you wrote:
>>>
>>> 
>>>
>>>      
>>>
>>>>Hi,
>>>>
>>>>To reload, start, stop, deploy, undeploy contexts see the Manager :
>>>>http://jakarta.apache.org/tomcat/tomcat-5.5-doc/manager-howto.html
>>>>
>>>>I don't know your tomcat version, but it works since TC 4.
>>>>
>>>>Cheers.
>>>>
>>>>On Thu, 17 Mar 2005 08:32:54 +0100
>>>>Roland Carlsson <ro...@alfa-moving.se> wrote:
>>>>
>>>>   
>>>>
>>>>        
>>>>
>>>>>Hi!
>>>>>
>>>>>I have a problem with an webapp with deploying webapps. The problem is the
>>>>>contextfile that since my development environment differs a little to my
>>>>>deployment environment have to be edited a little after deployment. But how
>>>>>do I force tomcat to re-load the context? Right now the only way I know
>>>>>about is to reboot tomcat witch leads to a full stop of all my web-apps
>>>>>instead of only one witch in turn leads to more complaints from my users.
>>>>>
>>>>>So, is there a way to force reload of the context when reloading the
>>>>>web-app?
>>>>>
>>>>>Thanks in advance
>>>>>Roland Carlsson
>>>>>
>>>>>
>>>>>---------------------------------------------------------------------
>>>>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>>>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>>>>
>>>>>
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>---------------------------------------------------------------------
>>>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>>>   
>>>>
>>>>        
>>>>
>>>---------------------------------------------------------------------
>>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>>
>>>
>>>
>>> 
>>>
>>>      
>>>
>>---------------------------------------------------------------------
>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>    
>>
>
>
>---------------------------------------------------------------------
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>
>
>
>  
>

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Re: Reload webapp and context

Posted by Bernard <bh...@actrix.gen.nz>.
Hi Torrey,

I can't comment on .war file deployment directly because I am not
using it. But I want to help you anyway, suggesting the approach I
would take.

I would forget manager for a moment. A basic servlet engine (these
things have been around for 10 years or more, remember Sun's Java
Server) are capable to reload servlets if any of the watched resources
change.

Server restart for your purpose is a very sad state of affairs, not
acceptable by today's standards.

So I would try to touch any of the watched resources, e.g. a servlet
class file, a servlet jar file or the web.xml file.

That, from my experience with old mod_jserv, does not immediately
trigger class re-loading. Only the next servlet request provides the
event for that (noticable delay of servlet response).

If that does not work, then you have the most basic problem. If it
works, then you have a feeling for how it should work. Then work your
way up to war file deplayment with manager.
I would think that you don't need manager for most management tasks
e.g. war file deployment because who can assume that you want to
introduce a security risk by providing such powerful access to your
application via http???

Playing around a little is sometimes very useful.

Regards,

Bernard

On Thu, 17 Mar 2005 18:50:40 -0800, you wrote:

>I have a similar problem in 5.5 when deploying my .war files. If I go to 
>the manager and undeploy a webapp that was deployed from a war it only 
>deletes the .war file and not the exploded directory. If I want to 
>deploy an update I have to stop tomcat and start it again for it to 
>pickup the change in the war file. Even when I have auto-deploy set to 
>true.
>
>I have done everything I can think of but it seems that to make an 
>update like this in Tomcat you have to stop and restart which is really 
>unfortunate.
>
>Bernard wrote:
>
>>Roland,
>>
>>You might want to add yourself to the cc list of this bug:
>>
>>Normal startup causes server error 500
>>    http://issues.apache.org/bugzilla/show_bug.cgi?id=34050
>>
>>It might be in the area of your interest.
>>
>>Regards,
>>
>>Bernard
>>
>>
>>On Thu, 17 Mar 2005 11:02:57 +0100, you wrote:
>>
>>  
>>
>>>Hi,
>>>
>>>To reload, start, stop, deploy, undeploy contexts see the Manager :
>>>http://jakarta.apache.org/tomcat/tomcat-5.5-doc/manager-howto.html
>>>
>>>I don't know your tomcat version, but it works since TC 4.
>>>
>>>Cheers.
>>>
>>>On Thu, 17 Mar 2005 08:32:54 +0100
>>>Roland Carlsson <ro...@alfa-moving.se> wrote:
>>>
>>>    
>>>
>>>>Hi!
>>>>
>>>>I have a problem with an webapp with deploying webapps. The problem is the
>>>>contextfile that since my development environment differs a little to my
>>>>deployment environment have to be edited a little after deployment. But how
>>>>do I force tomcat to re-load the context? Right now the only way I know
>>>>about is to reboot tomcat witch leads to a full stop of all my web-apps
>>>>instead of only one witch in turn leads to more complaints from my users.
>>>>
>>>>So, is there a way to force reload of the context when reloading the
>>>>web-app?
>>>>
>>>>Thanks in advance
>>>>Roland Carlsson
>>>>
>>>>
>>>>---------------------------------------------------------------------
>>>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>>>
>>>>
>>>>      
>>>>
>>>---------------------------------------------------------------------
>>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>>    
>>>
>>
>>
>>---------------------------------------------------------------------
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>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>
>>
>>
>>  
>>
>
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Re: Reload webapp and context

Posted by Torrey Rice <ri...@sitepen.com>.
I have a similar problem in 5.5 when deploying my .war files. If I go to 
the manager and undeploy a webapp that was deployed from a war it only 
deletes the .war file and not the exploded directory. If I want to 
deploy an update I have to stop tomcat and start it again for it to 
pickup the change in the war file. Even when I have auto-deploy set to 
true.

I have done everything I can think of but it seems that to make an 
update like this in Tomcat you have to stop and restart which is really 
unfortunate.

Bernard wrote:

>Roland,
>
>You might want to add yourself to the cc list of this bug:
>
>Normal startup causes server error 500
>    http://issues.apache.org/bugzilla/show_bug.cgi?id=34050
>
>It might be in the area of your interest.
>
>Regards,
>
>Bernard
>
>
>On Thu, 17 Mar 2005 11:02:57 +0100, you wrote:
>
>  
>
>>Hi,
>>
>>To reload, start, stop, deploy, undeploy contexts see the Manager :
>>http://jakarta.apache.org/tomcat/tomcat-5.5-doc/manager-howto.html
>>
>>I don't know your tomcat version, but it works since TC 4.
>>
>>Cheers.
>>
>>On Thu, 17 Mar 2005 08:32:54 +0100
>>Roland Carlsson <ro...@alfa-moving.se> wrote:
>>
>>    
>>
>>>Hi!
>>>
>>>I have a problem with an webapp with deploying webapps. The problem is the
>>>contextfile that since my development environment differs a little to my
>>>deployment environment have to be edited a little after deployment. But how
>>>do I force tomcat to re-load the context? Right now the only way I know
>>>about is to reboot tomcat witch leads to a full stop of all my web-apps
>>>instead of only one witch in turn leads to more complaints from my users.
>>>
>>>So, is there a way to force reload of the context when reloading the
>>>web-app?
>>>
>>>Thanks in advance
>>>Roland Carlsson
>>>
>>>
>>>---------------------------------------------------------------------
>>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>>
>>>
>>>      
>>>
>>---------------------------------------------------------------------
>>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>>    
>>
>
>
>---------------------------------------------------------------------
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>
>
>
>  
>

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Re: Reload webapp and context

Posted by Bernard <bh...@actrix.gen.nz>.
Roland,

You might want to add yourself to the cc list of this bug:

Normal startup causes server error 500
    http://issues.apache.org/bugzilla/show_bug.cgi?id=34050

It might be in the area of your interest.

Regards,

Bernard


On Thu, 17 Mar 2005 11:02:57 +0100, you wrote:

>Hi,
>
>To reload, start, stop, deploy, undeploy contexts see the Manager :
>http://jakarta.apache.org/tomcat/tomcat-5.5-doc/manager-howto.html
>
>I don't know your tomcat version, but it works since TC 4.
>
>Cheers.
>
>On Thu, 17 Mar 2005 08:32:54 +0100
>Roland Carlsson <ro...@alfa-moving.se> wrote:
>
>> Hi!
>> 
>> I have a problem with an webapp with deploying webapps. The problem is the
>> contextfile that since my development environment differs a little to my
>> deployment environment have to be edited a little after deployment. But how
>> do I force tomcat to re-load the context? Right now the only way I know
>> about is to reboot tomcat witch leads to a full stop of all my web-apps
>> instead of only one witch in turn leads to more complaints from my users.
>> 
>> So, is there a way to force reload of the context when reloading the
>> web-app?
>> 
>> Thanks in advance
>> Roland Carlsson
>> 
>> 
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>> For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>> 
>> 
>
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Re: Reload webapp and context

Posted by Lionel Farbos <li...@free.fr>.
Hi,

To reload, start, stop, deploy, undeploy contexts see the Manager :
http://jakarta.apache.org/tomcat/tomcat-5.5-doc/manager-howto.html

I don't know your tomcat version, but it works since TC 4.

Cheers.

On Thu, 17 Mar 2005 08:32:54 +0100
Roland Carlsson <ro...@alfa-moving.se> wrote:

> Hi!
> 
> I have a problem with an webapp with deploying webapps. The problem is the
> contextfile that since my development environment differs a little to my
> deployment environment have to be edited a little after deployment. But how
> do I force tomcat to re-load the context? Right now the only way I know
> about is to reboot tomcat witch leads to a full stop of all my web-apps
> instead of only one witch in turn leads to more complaints from my users.
> 
> So, is there a way to force reload of the context when reloading the
> web-app?
> 
> Thanks in advance
> Roland Carlsson
> 
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
> 
> 

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