How can I call a method with variable arguments in BaseX with Java binding? I am trying to do this:

let $string := 'Format string: %1$d - %2$s'

let $i := 1

let $j := 'text'

    return
        Q{java.lang.String}format·java.lang.String·java.lang.Object*($string,
        $string, $i, $j)

However, I got the error: [XPDY0002] {java.lang.String}format·java.lang.Stri...: Context is undeclared.
Thank you for your time.