During maven3 evaluation I have found this cool feature. Maven3 pom can be pom.groovy, pom.ruby etc. That creates much cleaner code and lets you integrate logic directly into the pom. And it already works!

Software:

Maven3 polyglot 0.8-SNASPHOT

Should also work for:

other Maven3 polyglot versions
Maven3 (after and if it is integrated)

1

Future of Maven3: multy-language support is built in?

For now maven3 polyglot is not a part of maven3. And it hasn’t reached the 1.0 version as well.
For now it can build from pom files written in languages like Groovy and Scala, and in can transform your pom.xml into other languages like pom.ruby or pom.groovy.

My guess, it will be a part of maven3 tool after it is finished and stable… From what I could learn, it is going to happen (see “Read more” section )

2

Install maven3 polyglot

Maven3 polyglot is NOT a part of Maven3 (maybe just yet, maybe it will never be).
So, having maven3 will not give you the capability to use another languages for pom.

Here is the site: http://polyglot.sonatype.org/

Get current version, unzip it in your favorite Maven location.
http://polyglot.sonatype.org/site-nexus/download/

In my case, it is (M2_HOME=/opt/pmaven)

Then, in your .bashrc, .profile or anywhere you setup your environment, just add:

M2_HOME=/opt/pmaven

export PATH=$M2_HOME/bin:$PATH
cd maven3-groovy-test

Test it:

> mvn --version
Apache Maven 3.0-alpha-7 (r921173; 2010-03-09 23:31:07+0100)
Java version: 1.6.0_18
Java home: /opt/dev/lang/jdk1.6.0_18/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux" version: "2.6.31-20-generic" arch: "i386" Family: "unix"

3

Simple pom.groovy

pom.groovy is:

• more readable
• dynamic, can contain logic
• shorter

 
Create some directory, called “groovy-test” and put pom.groovy with following source in it:

project {
    modelVersion '4.0.0'
    artifactId 'groovy-pom'
    groupId 'groovy-pom'
    version '0.0.1-SNAPSHOT'
    name 'groovy-pom'
    url 'http://maven.apache.org'

    def randomNumberClosure = { one, two ->
        println "Closures in pom   "+ ( one + two )
    }

    println "================================="
    println "YES, WE CAN GROOVY POM's AND MORE"
    println "================================="
    randomNumberClosure ( 10, 20 )

    build {
        testResources {
            testResource {
                filtering 'true'
                directory 'src/test/resources'
            }
        }
    }
    profiles {
        profile {
            id 'development'
            properties {
                'log4j.level' 'DEBUG'
            }
        }
        profile {
            id 'production'
            properties {
                'log4j.level' 'WARN'
            }
        }
    }

    properties {
        'log4j.level' 'info'
    }
}

4

Run it

cd groovy-test
mvn compile

Read more

1) http://polyglot.sonatype.org/development.html
2) http://www.mail-archive.com/dev@maven.apache.org/msg82018.html
3) http://www.sonatype.com/people/author/jason/
4) http://blog.xebia.fr/2009/11/27/devoxx-jour-4-maven-reloaded/ (Polyglot Maven)