Log4j and OSGi

[Jacob Kjome <ho...@visi.com>]

What does everyone think about releasing OSGi ready Log4j jars?  OSGi 
is quickly becoming popular.  In order for OSGi apps to depend on 
Log4j in an OSGi environment, certain MANIFEST.mf entries need to 
exist.  There's a Maven plugin that performs the OSGi packaging 
called the "maven-bundle-plugin".

I'm not necessarily suggesting we get this in for 1.2.15, but maybe 
for the following release.  The plugin would look something like the 
following (see below).  This is based on Log4j bundles predefined at 
osgi.org [1] as well as looking at the Apache Felix project [2] and 
how the "maven-bundle-plugin" is used in that project.  In addition 
to tweaking the <Export-Package> below, we may also want to define 
<Import-Package> and <Private-Package> (among other possible bundle 
manifest attributes to define).

The SLF4J project made their jar artifacts OSGi friendly.  Seems like 
a good idea to do the same for Log4j.

Thoughts?

Jake


[1] 
http://www2.osgi.org/Repository/HomePage?cmd=browse&keywords=log4j&submit=search
[2] http://felix.apache.org/

       <plugin>
         <groupId>org.apache.felix</groupId>
         <artifactId>maven-bundle-plugin</artifactId>
         <version>1.1.0-SNAPSHOT</version>
         <extensions>true</extensions>
         <configuration>
           <instructions>
             <Bundle-Name>Log4j</Bundle-Name>
             <Bundle-Vendor>Apache Logging Log4j Project</Bundle-Vendor>
             <Bundle-Description>Log4j</Bundle-Description>
             <Export-Package>
                org.apache.log4j,
                org.apache.log4j.chainsaw,
                org.apache.log4j.config,
                org.apache.log4j.helpers,
                org.apache.log4j.jdbc,
                org.apache.log4j.jmx,
                org.apache.log4j.lf5,
                org.apache.log4j.lf5.config,
                org.apache.log4j.lf5.util,
                org.apache.log4j.lf5.viewer,
                org.apache.log4j.lf5.viewer.categoryexplorer,
                org.apache.log4j.lf5.viewer.configure,
                org.apache.log4j.lf5.viewer.images,
                org.apache.log4j.net,
                org.apache.log4j.nt,
                org.apache.log4j.or,
                org.apache.log4j.or.jms,
                org.apache.log4j.or.sax,
                org.apache.log4j.spi,
                org.apache.log4j.varia,
                org.apache.log4j.xml
             </Export-Package>
           </instructions>
         </configuration>
       </plugin>


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