Reflections invoke NoSuchMethodException help

Question

Hello everyone,
I've been reading a lot about reflections on the forum lately, and figured it was the perfect way to dynamically call a method based on string input. However, while I can get the SampleInvoke program that is in the reflections tutorial to work, I can't seem to invoke a method that I write myself. I think I'm close, but there must just be a little something wrong...could anyone lend me a hand?
   public void foo()
        System.out.println("Worked!");
   } // end foo
   public void bar()
        Class c = this.getClass();
        Class[] params = new Class[] { null };
        Object[] args = new Object[] { null };
        Method m;
           try {
               m = c.getMethod("foo", params);
              m.invoke(c, args);
             } catch (NoSuchMethodException e) {
                 System.out.println(e);
             } catch (IllegalAccessException e) {
                 System.out.println(e);
             } catch (InvocationTargetException e) {
                 System.out.println(e);
   }What I'm getting is:
java.lang.NoSuchMethodException: SampleInvoke.foo(null)
But it's clearly in the class...
Any help is appreciated,
Joe

Answer 1

enlightenment
Try
m = c.getMethod("foo", null);
Oh! Okay, if I do that on both the c.getMethod line
AND the m.invoke line, it works, however, both show
up as warnings, "Varargs arguments null should be
cast to Class[] when passed to the method
getMethod..."
or
"Varargs arguments null should be cast to Object[]
when passed to the method invoke..."
However, when I attempt to cast them, it goes back to
NoSuchMethodException output. I guess I'm willing to
live with a bunch of warnings, but I wonder why?Try to feed them "new Class[0]" and "new Object[0]". Haven't dealt with varargs yet, so I can't help you with that.