Groovy script executable

Question

I'd like to make my groovy script portable and I inserted in the first line:

#!/usr/bin/env groovy

The problem comes up when I run the script outside of its directory, it can't find libraries. I come from python world and all imports in python resolving relatively script's path. In groovy it seems I have to specify -classpath but I can't do that in the first #! line.

Any suggestions how to resolve it?

I wouldn't like to hardcode my:class:path there and it's impossible to use something like #!/usr/bin/env groovy -cp dirname $0 — Soid
– Soid, Commented May 24, 2012 at 4:14

OverZealous · Accepted Answer · 2012-05-24 07:49:28Z

10

If the libraries are stored in a Maven repository that is accessible wherever you want to run it, one solution would be to use Grape to grab the libraries.

This provides several benefits:

You don't have to worry about the classpath at all
You don't have to distribute the libraries — just make sure Groovy is available on the client
Libraries are downloaded just once, so even if you upgrade the application, you only have to redistribute the .groovy file.

A simple example:

#!/usr/bin/env groovy

@Grab(group='commons-io', module='commons-io', version='2.3')
import org.apache.commons.io.FileUtils

... use FileUtils like normal ...

There's a lot of existing libraries available on mvnrepository.com already.

Even if you have non-public libraries, it's relatively easy to put your own libraries into a local / private repository.

answered May 24, 2012 at 7:49

OverZealous

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4 Comments

Soid Over a year ago

Actually it's not libraries but part of application - just application packages, classes, etc...

OverZealous Over a year ago

You could put all of that into a single Jar.

OverZealous Over a year ago

Possibly? A JAR is just a ZIP with a manifest. Otherwise, if you already have a bunch of loose files, why don't you just wrap your Groovy application in a shell script, and run that instead?

Soid Over a year ago

That's an option. Just it would be one extra file that runs the groovy script. As I said I came from python world and that wouldn't happen there. I was just curious how it worked in groovy.

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