How do I reflectively invoke a method with null as argument?

Question

I am trying to invoke this method in Java reflectively:

public void setFoo(ArrayList foo) { this.foo = foo; }

The problem is that

Answer 1

For me, this DOES NOT work:

m.invoke ( c.newInstance() , new Object[] { null } );

BUT this works:

m.invoke ( c.newInstance() , new Object[] { } );