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<String> foo) { this.foo = foo; } 

The problem is that I want to pass null as null, so that foo becomes null.

However, in the following approach it assumes that there are no arguments, and I get IllegalArgumentException(wrong number of arguments):

method.invoke(new FooHolder(), null); // -----------------------------^ - I want null to be passed to the method... 

How is this accomplished?

Answer 1

Try

method.invoke(new FooHolder(), new Object[]{ null });