Github user mattf-horton commented on a diff in the pull request:

    https://github.com/apache/metron/pull/530#discussion_r131764397
  
    --- Diff: bundles-lib/README.md ---
    @@ -0,0 +1,79 @@
    +# Apache Metron Bundles
    +
    +Apache Metron Bundles and this documentation are a derivitave of the 
[Apache Nifi](http://www.nifi.apache.org) 
[NARs](http://nifi.apache.org/developer-guide.html).
    +
    +When software from many different organizations is all hosted within
    +the same environment, Java ClassLoaders quickly
    +become a concern. If multiple components have a dependency on the same
    +library but each depends on a different
    +version, many problems arise, typically resulting in unexpected
    +behavior or `NoClassDefFoundError` errors occurring.
    +In order to prevent these issues from becoming problematic, Apache NiFi
    +introduces the notion of a NiFi Archive, or NAR.  The Apache Metron 
project has adapted and extended the NAR system as
    +Apache Metron Bundles.
    +
    +A BUNDLE allows several components and their dependencies to be packaged
    +together into a single package.
    +The BUNDLE package is then provided ClassLoader isolation from other 
BUNDLES
    +packages. Developers should always deploy their Apache Metron Extensions 
as BUNDLE packages.
    +
    +To achieve this, a developer creates a new Maven Artifact, which we
    +refer to as the BUNDLE artifact. The packaging is
    +set to `bundle`. The `dependencies` section of the POM is then created so
    +that the BUNDLE has a dependency on all Extension Components that are to 
be included within the BUNDLE.
    +
    +In order to use a packaging of `bundle`, we must use the 
`bundles-maven-plugin` module.
    +This is included by adding the following snippet to the bundle's pom.xml:
    +
    +
    +```xml
    +<build>
    +    <plugins>
    +        <plugin>
    +            <groupId>org.apache.metron</groupId>
    +            <artifactId>bundles-maven-plugin</artifactId>
    +            <version>0.4.0</version>
    --- End diff --
    
    0.4.1 is the minimum version that actually has bundles-maven-plugin.


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