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From Daniel Kulp <dk...@apache.org>
Subject Re: [DISCUSS] Trim down karaf distributions for 4.2
Date Wed, 11 Oct 2017 14:06:16 GMT

The PROBLEM with the in-JDK version of the DOM is that just creating a new empty document
involved a call to System.getProperty(…) which is a synchronized call.   The Apache xerces
version does not have that problem.   Thus, by removing the xerces jar, performance of certain
uses cases will drop with high concurrency.  Unfortunately, CXF is one of those use cases.


> On Oct 11, 2017, at 2:00 PM, Guillaume Nodet <gnodet@apache.org> wrote:
> The point that makes me raise this problem is that the karaf default
> distribution uses the Apache versions of xerces and xalan.  Fwiw, the
> latest xerces release is from 2011 and the latest xalan from 2014, so
> they're not the most active.  In particular, xalan latest release does not
> implement jaxp 1.4.
> One additional point is that those libraries stuff is broken on Java 9, so
> one option would be to remove it alltogether which bring us much closer to
> Java 9 support ;-)  Seriously, I'm not sure I want to spend too much time
> allowing pluggability for specs/implementations while the only real
> implementation provider is the JDK itself.  That's really a lot of work for
> no real benefit.
> In addition, the default distribution still install some "legacy" features
> such as aries-blueprint, shell-compat, etc...
> So here's a list of propositions for 4.2:
>  * remove all libraries for specs / impls from apache-karaf distro
>  * remove support for endorsed / ext libraries in the <library> element
> and wherever used
>  * remove aries-blueprint and shell-compat from default distro
>  * remove a few features from the karaf-minimal distro. I'm not sure which
> one exactly, but I think we should get the zip under 10 Mb.  Maybe only
> keeping jaas, shell, feature, ssh, bundle, config, deployer and log, also
> removing equinox / logback bundles...
> Thoughts ?
> -- 
> ------------------------
> Guillaume Nodet

Daniel Kulp
dkulp@apache.org - http://dankulp.com/blog
Talend Community Coder - http://coders.talend.com

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