java: Reflection with array argument - java.lang.IllegalArgumentException: wrong number of arguments

For example, you have am arrayPrint method, which takes a String[] as its argument, in the Invoked class.

public class Invoked {
      public void arrayPrint(String[] items) {
            int i = 1;
            for (String item : items) {
                  System.out.println("Item "+ i ++ ": " + item);
            }
      }
}

Now, you want to call this arrayPrint method via reflection in the Invoker class.

public class Invoker {
      public static void main(String[] args) {
            String[] items = new String[3];
            items[0] = "Hello Dear!";
            items[1] = "So glad to see you.";
            items[2] = "How have you been?"

           Class invokedClass = Class.forName("Invoked");
           Method printMethod = invokedClass.getMethod("arrayPrint", String[].class);

           //This line will throw an Exception
           printMethod.invoke(new Invoked(), items);
     }
}

When it is executed, it throws the below exception.

Exception in thread "main" java.lang.IllegalArgumentException: wrong number of arguments
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at test.Invoker.main(Invoker.java:29)

This exception occurs because the invoke method takes each element in the items array as a separate argument, therefore, in this case, there are three arguments in total. But the arrayPrint method only takes one argument.

To fix it:
Change the line above that gives the exception to this:

      printMethod.invoke(new Invoked(), new Object[] {items});

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