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Posted to users@tomcat.apache.org by Theo Sweeny <th...@avios.com> on 2016/03/10 11:19:28 UTC
Tomcat 8 Shared cCassloader
Hello - I've recently noticed that there is no reference to shared.loader in this Tomcat How To guide seen here -
https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
Has the shared.loader property from within catalina.properties been deprecated?
If so - should shared.loader resources now be loaded via the common.loader instead?
Thank you,
Theo
Avios Group (AGL) Ltd is a limited company registered in England (registered number 2260073 and VAT number 512566754) whose registered address is Astral Towers, Betts Way, London Road, Crawley, West Sussex RH10 9XY . Avios Group (AGL) Limited is part of the IAG group of companies This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager.
Re: Tomcat 8 Shared Classloader
Posted by Mark Thomas <ma...@apache.org>.
On 10/03/2016 10:34, Theo Sweeny wrote:
> Hi Mark,
> ________________________________________
> From: Mark Thomas <ma...@apache.org>
> Sent: 10 March 2016 10:22
> To: Tomcat Users List
> Subject: Re: Tomcat 8 Shared cCassloader
>
> On 10/03/2016 10:19, Theo Sweeny wrote:
>> Hello - I've recently noticed that there is no reference to shared.loader in this Tomcat How To guide seen here -
>>
>> https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
>>
>> Has the shared.loader property from within catalina.properties been deprecated?
>
> No. It was removed because it was rarely used / needed.
>
>> If so - should shared.loader resources now be loaded via the common.loader instead?
>
> You can re-introduce the shared loader (and the catalina loader) if you
> want to.
>
> Mark
>
> Thanks for the heads up.
>
> The motivation for asking this question is that we do have issues with web apps classes not being removed cleanly from memory after they are undeployed, which eventually results Perm Gen errors.
>
> Is it safe to say that using shared.loader would not contribute to this issue?
That isn't strictly true. Using the shared loader will (probably) mask
the issue but the issue will still be there. In addition, you'll have
some extra problems. Namely:
- all webapps have to use exactly the same version of the JAR in the
shared loader
- you'll need to exclude those JARs from your build process
- you'll have to stop Tomcat if you want to update the JARs in the
shared loader
If you can live with those restrictions then you should be OK.
Personally, I'd be looking at fixing the memory leaks but that is just me.
Mark
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Re: Tomcat 8 Shared Classloader
Posted by Theo Sweeny <th...@avios.com>.
Hi Mark,
________________________________________
From: Mark Thomas <ma...@apache.org>
Sent: 10 March 2016 10:22
To: Tomcat Users List
Subject: Re: Tomcat 8 Shared cCassloader
On 10/03/2016 10:19, Theo Sweeny wrote:
> Hello - I've recently noticed that there is no reference to shared.loader in this Tomcat How To guide seen here -
>
> https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
>
> Has the shared.loader property from within catalina.properties been deprecated?
No. It was removed because it was rarely used / needed.
> If so - should shared.loader resources now be loaded via the common.loader instead?
You can re-introduce the shared loader (and the catalina loader) if you
want to.
Mark
Thanks for the heads up.
The motivation for asking this question is that we do have issues with web apps classes not being removed cleanly from memory after they are undeployed, which eventually results Perm Gen errors.
Is it safe to say that using shared.loader would not contribute to this issue?
Theo
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Avios Group (AGL) Ltd is a limited company registered in England (registered number 2260073 and VAT number 512566754) whose registered address is Astral Towers, Betts Way, London Road, Crawley, West Sussex RH10 9XY . Avios Group (AGL) Limited is part of the IAG group of companies This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager.
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Re: Tomcat 8 Shared cCassloader
Posted by Mark Thomas <ma...@apache.org>.
On 10/03/2016 10:19, Theo Sweeny wrote:
> Hello - I've recently noticed that there is no reference to shared.loader in this Tomcat How To guide seen here -
>
> https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
>
> Has the shared.loader property from within catalina.properties been deprecated?
No. It was removed because it was rarely used / needed.
> If so - should shared.loader resources now be loaded via the common.loader instead?
You can re-introduce the shared loader (and the catalina loader) if you
want to.
Mark
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