RE: Ant and Groovy integration (Gravy)

Hi Scott,

thanx for your post!
This is very useful for me.

cheers
Mittie

> -----Original Message-----
> From: Scott Stirling [mailto:scottstirling-KealBaEQdz4@xxxxxxxxxxxxxxxx]
> Sent: Montag, 22. November 2004 20:13
> To: dev-i9PBDF1N6cxnkHa44VUL00B+6BGkLq7r@xxxxxxxxxxxxxxxx; 
> user-i9PBDF1N6cxnkHa44VUL00B+6BGkLq7r@xxxxxxxxxxxxxxxx
> Subject: [groovy-user] Ant and Groovy integration (Gravy)
> 
> 
> Hi,
> 
> Here's a little hack that I think represents a stabler pattern 
> for integrating
> Ant and Groovy at the infrastructural layer.
> 
> Problem:
> - Groovy bundles some Ant jars and loads them in classloader A
> - Many real Ant builds use different versions of Ant and/or 3rd 
> party Ant tasks
> such as XDoclet, XMLTask, PMD, JUnit, Beanshell scripts, etc., 
> which are often
> installed in ANT_HOME/lib or are referenced in build script classpaths. 
> - Adding 3rd party jars for Ant builds to the Groovy classpath 
> using the -cp or
> -classpath options on the command line causes conflicts because of the
> classloader hierarchy
> - Groovy currently ships minimal Ant 1.6.1 jars and JUnit's jar 
> for the Ant
> junit task, but this is ad hoc and arbitrary and leave Ant and 
> JUnit version
> upgrade issues unanswered.
> - Groovy's AntBuilder needs minimal Ant jars to work at all with 
> built-in tasks
> 
> Solution:
> - Define clear integration points to decouple Groovy and Ant
> - use groovy-classworlds.conf to put ANT_HOME/lib first in the 
> Groovy classpath. 
> 
> Advantages:
> - allows me to use Groovy to execute a whole bunch of existing 
> build scripts I
> have with no changes
> - allows me to re-use existing Ant installation infrastructure we 
> have on every
> desktop or in every project in source control
> - minimal changes to Groovy scripts/config
> 
> Check it out:
> 
> Change to $GROOVY_HOME/conf/groovy-classworlds.conf
> # NEW: Load all libs under ANT_HOME first
> load ${ant.home}/lib/*
> 
> # Load required libraries
> load ${groovy.home}/lib/*.jar
> 
> 
> Then in the bin/groovy script, I added a -D to set ant.home to ANT_HOME:
>     exec $JAVACMD $JAVA_OPTS \
>         -classpath "$CP" \
>         -Dprogram.name="$PROGNAME" \
>         -Dclassworlds.conf="$CLASSWORLDS_CONF" \
>         -Dgroovy.home="$GROOVY_HOME" \
>         -Dant.home="$ANT_HOME" \                   <-- NEW
>         -Dtools.jar="$TOOLS_JAR" \
>         org.codehaus.classworlds.Launcher "$@"
> 
> Hope someone finds this useful. I've got some more stuff to share 
> soon, but need
> to vet it out a bit here first.
> 
> Thanks,
> Scott Stirling
> Framingham, MA
>