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https://issues.apache.org/jira/browse/LUCENE-636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12486840
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Ken Geis commented on LUCENE-636:
---------------------------------

This is not going to be sufficient.  There are active code paths that still use 
System.getProperty(..).  For instance, the static initializers of FSDirectory 
and SegmentReader.

If I load up a Compass-based web app, and it uses an old version of Lucene that 
works off system properties, it will set the 
org.apache.lucene.SegmentReader.class property to use a Compass-specific 
segment reader.  Then in another web app that uses a current version of Lucene 
that has "moved away from using system properties," the application will crash 
when it tries to load the SegmentReader class.

> [PATCH] Differently configured Lucene 'instances' in same JVM
> -------------------------------------------------------------
>
>                 Key: LUCENE-636
>                 URL: https://issues.apache.org/jira/browse/LUCENE-636
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Johan Stuyts
>         Attachments: Lucene2DifferentConfigurations.patch
>
>
> Currently Lucene can be configured using system properties. When running 
> multiple 'instances' of Lucene for different purposes in the same JVM, it is 
> not possible to use different settings for each 'instance'.
> I made changes to some Lucene classes so you can pass a configuration to that 
> class. The Lucene 'instance' will use the settings from that configuration. 
> The changes do not effect the API and/or the current behavior so are 
> backwards compatible.
> In addition to the changes above I also made the SegmentReader and 
> SegmentTermDocs extensible outside of their package. I would appreciate the 
> inclusion of these changes but don't mind creating a separate issue for them.

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