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

A bit of an explanation to the solutions already posted.

Method.invoke() is declared as a variable arity function, and that means that normally you don't need to explicitly create an object array. Only because you pass a single parameter, which could be interpreted as an object array itself, does method.invoke( obj, null) fail.

If for example your method had two parameters, method.invoke( obj, null, null) would work perfectly fine.

However if your method has a single Object[] parameter, you always have to wrap it.