Reflecting Java instance methods with primitives

reflect.java

	private static final Map<Class<?>, Class<?>> W2P; // wrapper to primitive

	static {
		W2P = new HashMap<>();
		W2P.put(Boolean.class, boolean.class);
		W2P.put(Byte.class, byte.class);
		W2P.put(Character.class, char.class);
		W2P.put(Double.class, double.class);
		W2P.put(Float.class, float.class);
		W2P.put(Integer.class, int.class);
		W2P.put(Long.class, long.class);
		W2P.put(Short.class, short.class);
		W2P.put(Void.class, void.class);
	}
  
  	Object invokeMethod(String name, Object... args) { // invoke on this object
		Class<? extends Object>[] classes = new Class<?>[args.length];
		for (int i = 0; i < args.length; i++) {
			if (W2P.containsKey(args[i].getClass())) {
				classes[i] = W2P.get(args[i].getClass());
			} else {
				classes[i] = args[i].getClass();
			}
		}
		try {
			Method method = this.getClass().getSuperclass().getDeclaredMethod(name, classes);
			Object ret = method.invoke(this, args);
			return ret;
		} catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException
				| InvocationTargetException e) {
			System.err.println(e);
			return null;
		}
	}