java.lang.IllegalArgumentException: wrong number of arguments While using Java Reflection

I have a sample class

  package temp.com.test;  
  public class Client{
     public String testReflection(String arg1, int arg2, int arg3){
     return arg1+arg2+arg3;
}}

Here is my class which perform reflection

  public class reflectionTemp{
   Method method = null;
  public String refImpl(){
  try {
                Class<?> cls = Class.forName("temp.com.test.Client");
                Object obj = cls.newInstance();
  Class[] argTypes = new Class[3];
  argTypes[0] = Class.forName("Java.lang.String");
  argTypes[1] = Integer.TYPE;
  argTypes[2] = Integer.TYPE;
  Object[] argValues =  new Object[3];
  argValues[0] = "temp";
  argValues[1] = 1;
  argValues[2] = 2;
method = cls.getDeclaredMethod("testReflection",argTypes);
Object response = method.invoke(obj, argValues);
}Catch(Exception e){
 //do something
}
   }

on the line method.invoke(obj, argValues) it is throwing an error java.lang.IllegalArgumentException: wrong number of arguments, couldn't determine where i'm goign wrong any help is appreciated, thanks