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https://issues.apache.org/jira/browse/SOLR-5103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14703047#comment-14703047
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Noble Paul commented on SOLR-5103:
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bq.Well that is for us to dictate, isn't it? Who says the plugin format must 
conform to the JAR specs?

It's OK for the plugin format not conform to jar specs. The payload could be a 
zip file with multiple jars. But, is it a big deal to merge multiple jars. It 
solves a problem of name collisions. What if the same FQN of a class is found 
in two jars , which one to load? 

bq. and our plugin installer code handles merging all jars together into one 
jar plugin-xyz-merged.jar 

Please don't . The plugin installer should do as little magic as possible.

> Plugin Improvements
> -------------------
>
>                 Key: SOLR-5103
>                 URL: https://issues.apache.org/jira/browse/SOLR-5103
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>             Fix For: Trunk
>
>
> I think for 5.0, we should make it easier to add plugins by defining a plugin 
> package, ala a Hadoop Job jar, which is a self--contained archive of a plugin 
> that can be easily installed (even from the UI!) and configured 
> programmatically.



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