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From "Ken Geis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-670) improper isolation (overuse of system properties) allows Lucene apps to clobber each other
Date Fri, 08 Sep 2006 17:24:23 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-670?page=comments#action_12433447 ] 
            
Ken Geis commented on LUCENE-670:
---------------------------------

I guess I didn't search well enough for a previously submitted bug.

LUCENE-636 addresses my concerns and the patch is coded very close to how I had it in my head.

Please mark this as a duplicate of LUCENE-636.  (It doesn't appear that I have permission
to do so.)

> improper isolation (overuse of system properties) allows Lucene apps to clobber each
other
> ------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-670
>                 URL: http://issues.apache.org/jira/browse/LUCENE-670
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index, Store
>    Affects Versions: 2.0.0, 1.9
>         Environment: Tomcat
>            Reporter: Ken Geis
>            Priority: Critical
>
> As nicely stated by the Javadoc for org.apache.commons.discovery.tools.ManagedProperties,
"System properties are global in nature, so using them easily violates sound architectural
and design principles for maintaining separation between components and runtime environments."
 Lucene's use of system properties makes it so that one web application that uses Lucene can
break another web application that uses Lucene.
> Both org.apache.lucene.index.SegmentReader and org.apache.lucene.store.FSDirectory use
system properties to locate an implementation class.  Because of this, two applications can
step on each others' toes.
> So, I have two webapps running in Tomcat.  One uses the Compass Framework which sets
the SegmentReader implementation class to org.apache.lucene.index.CompassSegmentReader.  My
other webapp tries to initialize SegmentReader in a different classloader, and it fails with
an ExceptionInInitializerError because it can't load that class.  If I get lucky, the non-Compass
webapp loads first and things run smoothly.

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