Attribute 'requiredOptionMarker' should have type 'java.lang.Character'; but found type 'java.lang.String'

Question

Running Script FAILS with Groovy 3.0.19 but PASSES with Groovy 4.0.15

I'm trying to follow picocli documentation instructions specific to groovy scripts : Section 30.1.2. Groovy Scripts

There is a particular annotation named Command that has a requiredOptionMarker attribute. See section 14.4.4. Required-Option Marker requiredOptionMarker accepts a char.

In my script when I try to assign '*' to requiredOptionMarker my script fails to compile.

@Command(name = "sampleScript",
        mixinStandardHelpOptions = true,
        requiredOptionMarker = '*')

I get error :

Attribute 'requiredOptionMarker' should have type 'java.lang.Character'; but found type 'java.lang.String' in @picocli.CommandLine$Command
 @ line 63, column 32.
           requiredOptionMarker = '*',
                                  ^

1 error

Tried various suggestions like (char) '*' , '*' as char. Nothing seems to work.

While searching for it the closest I got to is this jira ticket GROOVY-3278

Any help is greatly appreciated.

EDIT 1 : START

Just in case any wants to play around, I have a MCVE at

https://github.com/akmalick/sample-picocli/blob/requiredOptionMarker/sample-picocli.groovy

The master branch contains script that will PASS

The requiredOptionMarker branch contains the script that recreates the issue and FAILS as it contains the requiredOptionMarker = '*' change.

EDIT 1 : END

EDIT 2 : START

After taking care of the comma as in

sortOptions = false,
    requiredOptionMarker = ((char)'*') //---->>>>> This DOES"T WORK

running without compile tatic I get something like this

>groovy sample-picocli.groovy

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
C:\ws\sample-picocli.groovy: 35: Expected '(char) *' to be an inline constant of type char in @picocli.CommandLine$Command
 @ line 35, column 32.
           requiredOptionMarker = ((char)'*') //---->>>>> This DOES"T WORK
                                  ^

C:\ws\picocli\sample-picocli.groovy: 35: Attribute 'requiredOptionMarker' should have type 'java.lang.Character'; but found type 'java.lang.Object' in @picocli.CommandLine$Command
 @ line 35, column 32.
           requiredOptionMarker = ((char)'*') //---->>>>> This DOES"T WORK
                                  ^

C:\ws\picocli\sample-picocli.groovy: 35: Expected '(char) *' to be an inline constant of type char in @picocli.CommandLine$Command
 @ line 35, column 32.
           requiredOptionMarker = ((char)'*') //---->>>>> This DOES"T WORK
                                  ^

C:\ws\picocli\sample-picocli.groovy: 35: Attribute 'requiredOptionMarker' should have type 'java.lang.Character'; but found type 'java.lang.Object' in @picocli.CommandLine$Command
 @ line 35, column 32.
           requiredOptionMarker = ((char)'*') //---->>>>> This DOES"T WORK
                                  ^

4 errors

EDIT 2 : END

Answer 1

Did you try the solution presented here? https://stackoverflow.com/a/33020020/1446916

Basically do a hard cast in your script:

@Command(
       …
    requiredOptionMarker = ((char) '*'))

Note that you need brackets around the whole thing: ((char) '*'), just (char) '*' may not work.