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From Nicolas Lalevée (JIRA) <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3167) Make lucene/solr a OSGI bundle through Ant
Date Sat, 16 Mar 2013 15:32:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604306#comment-13604306
] 

Nicolas Lalevée commented on LUCENE-3167:
-----------------------------------------

If I simplify, Maven dependency management is about declaring that a jar depends on another.
OSGi is more powerful/complex than that. It can do that jar to jar dependency, but it is not
recommended by the advocates of OSGi. The prefered way is when dependencies are declared between
the java packages. So instead of declaring a dependency on a jar, you declare a dependency
on a java package. It is then like declaring a dependency on an API rather than an implementation.
And then comes versioning into the mix : you have a version of an API (the java packages)
and the version of the implementation (the jar/bundle). So that static metadata in the manifest
is not trivial to maintain.
Then here comes some tools to help, the patches here use "bnd". The java packages are somewhat
part of the Java type system, so tools like bnd you can infer nearly automatically these dependencies.


Also note that contrary to the Maven world, the OSGi world doesn't have a world class reference
repository. So you do not need to upload it anywhere else. I guess this issue is "just" about
making the Lucene jars droppable in the OSGi environement as is.

Maybe if the Lucene committers doesn't feel enough confortable with OSGi, they should let
it to some external OSGi packagers, just like there are debian packagers. Here is a exemple
of an Ivy repository maintained by 'packagers': https://code.google.com/p/ivyroundup/. There
was a tentative for OSGi but it stalled: https://github.com/glyn/bundlerepo

                
> Make lucene/solr a OSGI bundle through Ant
> ------------------------------------------
>
>                 Key: LUCENE-3167
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3167
>             Project: Lucene - Core
>          Issue Type: New Feature
>         Environment: bndtools
>            Reporter: Luca Stancapiano
>         Attachments: LUCENE-3167_20130108.patch, LUCENE-3167.patch, LUCENE-3167.patch,
LUCENE-3167.patch, lucene_trunk.patch, lucene_trunk.patch
>
>
> We need to make a bundle thriugh Ant, so the binary can be published and no more need
the download of the sources. Actually to get a OSGI bundle we need to use maven tools and
build the sources. Here the reference for the creation of the OSGI bundle through Maven:
> https://issues.apache.org/jira/browse/LUCENE-1344
> Bndtools could be used inside Ant

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