Given:

public class X {
    
    private static native void xxx();
    public static void main(String [] args) {
        xxx();
    }

}

javac invoked with -XDfind=local-methods, prints:

/home/srikanth/tmp/X.java:3: warning: This method may be declared local to the method main(String[]) defined in class X
    private static native void xxx();
                               ^
1 warning