In java reflection, how to give primitive type's class information to method query? [duplicate]

This question already has an answer here:

• Java how to call method by reflection with primitive types as arguments 2 answers

For example I've:

class My{ void f(String s, int i){}}

OK, if I iterate all class method of "My", I get f parameter types as "java.lang.String" and "int". No problem. But when I use

My.class.getMethod(new Class[]{String.class, int});

It gives me a compilation error. Seems the primitive type of "int". If I change to

{String.class, Integer.class}

Then compilation is OK, but runtime exception of "NoSuchMethodException".

So my question is, in my case how to call "getMethod" to get back My.f()?

Thanks a lot!