-none- 2007-10-04 - By King, Sean
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Gabe,
Could you provide a little more detail on this? Unfortunately I am no
tomcat expert.
How would running two JVM's help?
Sean
-- --Original Message-- --
From: Gabe Wong [mailto:gabrielw@(protected)]
Sent: Thursday, October 04, 2007 10:21 AM
To: Tomcat Users List
Subject: Re: Webapp load order tomcat 4 vs tomcat 5
Sean,
From your description, it seems that communication between the 2 apps
is done over the wire.
If that is the case, why not run each under a separate JVM/Application
Server to avoid the class loading conflict.
King, Sean wrote:
> Without giving away too much information...
>
> I am working on an integration between the application that I develop
> and a third party application. A requirement of the integration is
> that my app receive unsolicited notifications from the third party app
> relating to status changes. This is achieved via a Muse webservice.
> The third party developers have provided my with all of the required
> Muse "stuff" in a war file. The war file contains a class that
> registers and maintains connections between my app and the other.
>
> So, to cut a long story short, my app needs to register with the
> supplied web app for the integration to work.
>
> This seems to work seamlessly with tomcat5 and this methodology is
> what we are planning to go into production with.
>
> Now it sounds like a bad idea!!
>
> -- --Original Message-- --
> From: Peter Crowther [mailto:Peter.Crowther@(protected)]
> Sent: Thursday, October 04, 2007 9:36 AM
> To: Tomcat Users List
> Subject: RE: Webapp load order tomcat 4 vs tomcat 5
>
>
>> From: King, Sean [mailto:Sean.King@(protected)] For the application to run
>> correctly, app2 must be deployed and start before app1. Using tomcat
>> 5
>>
>
>
>> this does not seem to be a problem. When I start tomcat, app2 is
>> deployed and then app1 starts and is able to access jars in app2. I
>> am
>>
>
>
>> hoping that this start order is not just pure chance!!
>>
>
> It is, indeed, pure chance.
>
>
>> I am now trying to port the application back to tomcat 4.
>> Unfortunately
>> I am consistently seeing that app1 starts first and then app2 is
>> deployed from the war. Since app1 depends on app2 this is a major
>> problem.
>>
>> Is there any way in tomcat 4 to force the war file to be deployed
>> first?
>>
>
> Hack the Tomcat source and recompile :-).
>
> More seriously, no, you can't rely on the startup order of webapps.
> As I recall, you can't even assume that only one will be started at
> one time (I'm sure the more experienced list members will correct me
> if the spec disallows this). You can try playing around with
> filenames until the order magically reverses, or you can amend the
> apps so that app1 doesn't need to access jars in app2 (which is,
> anyway, a bit unpleasant).
>
> Can you give us more information about why app1 needs app2 to start
> first? There may well be ways round the problem.
>
> - Peter
>
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--
Regards
Gabe Wong
Private JVM JAVA Hosting Automation
http://www.ngasi.com
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