for the test,

public class a
{
        void doNothing ()
        {
        }

        native void doStillNothing ();
}

when -stubs is used with javah

jtools-sqe:/home/vr128054/vertest/work 1853 % javah -stubs a
Error: JNI does not require stubs, please refer to the JNI documentation.

If this is the right behaviour, then please do give more clarifications in usage and tooldocs.