[GROOVY-9432] ClassNotFoundException when attempting to use Picocli via Grapes

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0, 3.0.1
• Fix Version/s: 3.0.4
• Component/s: Grape
• Environment: Reproduced under both macOS (Groovy 3.0.1 installed manually and via MacPorts) and Debian (Groovy installed via SDKMAN).
• External issue URL: https://github.com/remkop/picocli/issues/970
• Assignee: Remko Popma
• Reporter: Marc
• Created: 03/Mar/20 02:08
• Updated: 22/May/20 04:03
• Resolved: 30/Apr/20 22:47

Description

(Issue originally raised as: https://github.com/remkop/picocli/issues/970)

Consider the following minimal script:

@Grab('info.picocli:picocli:4.2.0')
import groovy.cli.picocli.CliBuilder

def cli = new CliBuilder()

Under Groovy 2.5.9, this runs without error; with 3.0.1, however, I see:

$ groovy cli.groovy 
Caught: java.lang.NoClassDefFoundError: picocli/CommandLine$ParameterException
java.lang.NoClassDefFoundError: picocli/CommandLine$ParameterException
at cli.run(cli.groovy:4)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Caused by: java.lang.ClassNotFoundException: picocli.CommandLine$ParameterException
... 4 more

The jar is definitely downloaded to ~/.groovy/grapes and both versions of Groovy output

Resolving dependency: info.picocli#picocli;4.2.0 {default=[default]}
Preparing to download artifact info.picocli#picocli;4.2.0!picocli.jar

when -Dgroovy.grape.report.downloads=true is supplied.