Hi,

I've been attempting to invoke a private method whose argument is a parameter and I can't quite seem to get it right.

Here's kind of how the code looks so far:

public class TestClass {
   public TestClass(){
   }

   private void simpleMethod( Map<String, Integer> testMap) {
      //code logic
   }
}

Then I attempt to use this to invoke the private method:

//Hashmap
Map <String, Integer> testMap = new HashMap <String, Integer>();

//method I want to invoke
Method simpleMethod = TestClass.class.getDeclaredMethod("simpleMethod", Map.class);
simpleMethod.setAccessible(true);

simpleMethod.invoke(testClassObject, testMap); //Throws an IllegalArgumentException 

As you can see, it throws an IllegalArgumentException. I've attempted to cast the hashmap back to a map, but that didn't work.

What am I doing wrong?