[GROOVY-9165] Grape cannot pull in picocli

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 2.5.5, 2.5.6, 2.5.7
• Fix Version/s: 3.0.0-beta-2
• Component/s: Grape, groovy-runtime
• Labels: breaking
• Assignee: Paul King
• Reporter: Remko Popma
• Created: 08/Jun/19 06:05
• Updated: 05/Mar/20 00:46
• Resolved: 07/Jul/19 11:09

Description

If I try to run a Groovy script I am unable to pull in a newer version of picocli via @Grab:

@Grab('info.picocli:picocli-groovy:4.0.0-beta-1b')
@GrabExclude('org.codehaus.groovy:groovy-all')
@picocli.groovy.PicocliScript
@picocli.CommandLine.Command
import picocli.CommandLine

println "Groovy version ${GroovySystem.version}"
println "Picocli version $CommandLine.VERSION"
 

Depending on the Groovy version, this prints

Groovy version 2.5.0
Picocli version 3.0.2

or

Groovy version 2.5.7
Picocli version 3.9.5

So the @Grab('info.picocli:picocli-groovy:4.0.0-beta-1b') is not honoured.

This is because the groovy.ui.GroovyMain class, which executes Groovy scripts, itself uses picocli to parse the command line parameters. Unfortunately, this means that Groovy script authors cannot control the picocli version used by their scripts.

Is there anything we can do to improve this?

Issue Links

• links to: GitHub Pull Request #962