java.lang.NoClassDefFoundError: Unable to load class groovy.util.OptionAccessor due to missing dependency Lorg/apache/commons/cli/CommandLine

[andre-r]

When I start a script (./groovyw script.groovy) which is using groovy.util.CliBuilder I get this exception:

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
General error during class generation: java.lang.NoClassDefFoundError: Unable to load class groovy.util.OptionAccessor due to missing dependency Lorg/apache/commons/cli/CommandLine;

java.lang.RuntimeException: java.lang.NoClassDefFoundError: Unable to load class groovy.util.OptionAccessor due to missing dependency Lorg/apache/commons/cli/CommandLine;
	at org.codehaus.groovy.control.CompilationUnit.convertUncaughtExceptionToCompilationError(CompilationUnit.java:1089)
	...

It works when I use groovy script.groovy.

script.groovy:

def cli = new CliBuilder(
        usage: 'script.groovy [options]',
        header: 'Options:')
cli.with {
    h longOpt: 'help', 'Show help message'
    _ longOpt: 'test', 'Test option'
}

OptionAccessor opts = cli.parse(args)
if (!opts) {
    System.exit(1)
}
if (opts.h) {
    cli.usage()
    System.exit(0)
}
if (opts.test) {
    println "With test option"
} else {
    println "Without test option"
}

Is it a bug or am I using it wrong?

$ ./gradlew --version

------------------------------------------------------------
Gradle 3.3
------------------------------------------------------------

Build time:   2017-01-03 15:31:04 UTC
Revision:     075893a3d0798c0c1f322899b41ceca82e4e134b

Groovy:       2.4.7
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.8.0_131 (Oracle Corporation 25.131-b11)
OS:           Linux 4.4.0-79-generic amd64

[Cervator]

Thanks for the report! It is most likely that I simply haven't added the provider for the command line stuff to the classpath the script is started with when you use the wrapper. I'm expecting a few of those issues since the way the wrapper is put together is extremely barebones. When you launch Groovy normally (or Gradle) you get a bunch more stuff on the classpath automatically.

I appreciate the script example! Should be an easy fix, will dig around :-)

[Cervator]

Fixed :-)

Pull the latest or download at https://github.com/MovingBlocks/groovy-wrapper/releases/tag/v1.0.2

Let me know if it works - I copy pasted your example into a script locally and got it working by adding commons-cli from the Gradle dist. Not really sure how much it makes sense to add from there - I doubt there's anything wrong in adding some of the basics like this, but there's probably a line somewhere after which it gets silly.

That's a way off though and I want this to be useful :-) Am actually surprised somebody else found it so relatively quickly, how'd you find it?

For more rare dependencies (and things not shipped with Gradle) it probably makes sense to use @Grab to fetch lib jars from an actual script. As an example I do that over in MovingBlocks/Terasology#2979 which is the first place I'm using the wrapper, to do some Git utility in that case:

@GrabResolver(name = 'jcenter', root = 'http://jcenter.bintray.com/')
@Grab(group='org.ajoberstar', module='grgit', version='1.9.3')
import org.ajoberstar.grgit.Grgit

[andre-r]

Thank you, my script works now. I just thought it should work by default since I was using groovy.util-classes. For other classes not shipped with Gradle I already have a @Grab in my script, that works. After using groovyw I also tried @Grab with commons-cli, but with the same error.

I found your groovy-wrapper as I was looking for a way to execute a groovy script on a windows machine where there is no groovy installed (but gradlew existed already in the code base). Actually I found another groovy-wrapper first, but this blends in better. 😁

[Cervator]

Glad it worked out! Both the fix and the utility. Cool to know there is in fact another Groovy Wrapper out there, I thought it would be weird to have nothing. I do like the sneaky free ride this one gets via the Gradle Wrapper :D