Any solution for Class.getMethod() reflection and

Question

I want to use

Class.getMethod(String name, Class... parameterTypes)

to find the method I need to invoke with the given parameters, but apparently as described in Bug 6176992 Java doesn't include autoboxing there. So if my reflected class has a method with a (String, int) signature you still get a NoSuchMethodException with a {String.class, Integer.class} array as a paremeter.

Is there any sollution for this? The only way I could think of to call getMethod() with every permutation of primitive and non primitive types which I don't really want to do.

Edit: To make it more clear: I am well aware of the primitive type classes, but I don't see how they could help to solve my problem. My parameterTypes array comes from somewhere and I know that it will only return non primitive types. I can not assume that the interface will only be declared with primitive types and that's exactly my problem:

public interface TestInterface()
{
    public void doTest(Integer i1, int i2, double d3, Double d);
}

Class<?>[] classes = { Integer.class, Integer.class, Double.class, Double.class }
// Due to autoboxing I should become the doTest method here, but it doesn't work
TestInterface.class.getMethod("doTest", classes);

Answer 1

Yeah you need to use Integer.TYPE or (equivalently) int.class.

Update: "My parameterTypes array comes from somewhere and I know that it will only return non primitive types." Well, then that's this "somewhere"'s problem. If they don't give you the proper signature of the method they want, then how are you going to find it? What if there are two overloaded methods, that differ only in one of them takes a primitive and the other one takes the wrapper class? Which one does it choose then? I mean, if you really have no choice then I guess you could just loop through all the methods, and look for one with the right name, and manually check all the parameter types for whether they are correct, or are the primitive equivalents.

Answer 2

If you have commons-lang with version >=2.5, you can use MethodUtils.getMatchingAccessibleMethod(...) which can handle the boxing types issues.