I don't understand UISelectMany with class names.
My addon defines a ui component for a class selection as such:
@WithAttributes(label = "targets", required = true, type = InputType.JAVA_CLASS_PICKER);
private UISelectMany<JavaResource> targets;
All other ui properties are optional.
In case it matters, in initializeUI I scan for qualified classes and add them to 'targets' with:
The intention of the above is for the select-list to be pre-populated.
Then, at runt time, I use forge command line:
<my addon's command> --targets org.example.library.rest.LibrarianRR
And it prompts, as follows, note that option  is not already selected.
***INFO*** Required inputs not satisfied, entering interactive mode
 ( ) org.example.library.book.model.BookRR
 ( ) org.example.library.rest.LibrarianRR
Press <ENTER> to confirm, or <CTRL>+C to cancel.
I would like to pass a class name for 'targets' UISelectMany in the command line....and skip the interactive mode. I don't want to be prompted after I specify a target on the command line.
This is a known bug and it is still present in the Shell UI. For now, change your type to UISelectMany<String> and it should work correctly.