[ http://issues.apache.org/jira/browse/SOLR-68?page=all ]
Hoss Man updated SOLR-68:
-------------------------
Attachment: classloader.patch
patch that creates a new classloader containing any JARs found in
${solr.home}/lib and uses that class loader anytime class names read from a
config file.
> Custom ClassLoader for "plugins"
> --------------------------------
>
> Key: SOLR-68
> URL: http://issues.apache.org/jira/browse/SOLR-68
> Project: Solr
> Issue Type: New Feature
> Reporter: Hoss Man
> Attachments: classloader.patch
>
>
> After beating my head against my desk for a few hours yesterday trying to
> document how to load custom plugins (ie: Analyzers, RequestHandlers,
> Similarities, etc...) in the various Servlet Containers -- only to discover
> that it is aparently impossible unless you use Resin, it occured to me in the
> wee hours of last night that since the only time we ever need to load
> "pluggable" classes is when explicitly lookup the class by name, we could
> make out own ClassLoader and use it ... so i whiped together a little patch
> to Config.java that would load JARs out of $solr.home}/lib and was seriously
> suprised to discover that it seemed to work.
> In the clod light of day, I am again suprised that I still think this might
> be a good idea, but i'm not very familiar with ClassLoader semantics, so i'm
> not sure if what i've done is an abomination or not -- or if the idea is
> sound, but the implimentation is crap.
> I'm also not sure if it works in all cases: more testing of various
> Containers would be good, as well as testing more complex sitautions (ie:
> what if a class explicitly named as a plugin and loaded by this new
> classloader then uses reflection to load another class from the same Jar
> using Thread.currentThread().getContextClassLoader() ... will that fail?)
> So far I've quick and dirty testing with my apachecon JAR under
> apache-tomcat-5.5.17, the jetty start.jar we use for the example,
> resin-3.0.21 and jettyplus-5.1.11-- all of which seemed to work fine except
> for jettyplus-5.1.11 -- but that may have been because of some other
> configuration problem I had.
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