Method subcommand with inherited mixed-in standard help options: failure

[deining]

Minimum working example:

import picocli.CommandLine;
import picocli.CommandLine.ScopeType;
import picocli.CommandLine.*;

@Command(scope = ScopeType.INHERIT, mixinStandardHelpOptions = true)
public class InheritApp  {

    @Command()
    void sub(@Option(names = "-foo") int foo) {
        System.out.printf("Foo: %d", foo);
    }

    public static void main (String... args) {
        new CommandLine(new InheritApp()).execute("sub", "-foo", "42" );
    }
}

When running this code, I'm getting

java.lang.IllegalArgumentException: argument type mismatch
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at picocli.CommandLine.executeUserObject(CommandLine.java:1972)
	at picocli.CommandLine.access$1300(CommandLine.java:145)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2352)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2346)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2311)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
	at picocli.CommandLine.execute(CommandLine.java:2078)
	at InheritApp.main(InheritApp.java:14)

It's the combination of inherited scope + mixinStandardHelpOptions that's causing trouble here. If I set scope to ScopeType.LOCAL, the sample runs fine.

[remkop]

@deining Thank you for raising this and thank you for the example to reproduce the issue!
Looking into this...

[remkop]

Thanks again for raising this!

In a nutshell: the cause had to do with calculating argument indexes for subcommand methods; the mixinStandardHelpOptions = true does not add method parameters, so is given special treatment. However, when scope = ScopeType.INHERIT, this special treatment should not be applied.

This is now fixed in master.