Here you can find the source of nvl(T t, String message)
public static <T> T nvl(T t, String message)
//package com.java2s; //License from project: Apache License public class Main { public static <T> T nvl(T t, String message) { if (t == null) throw new IllegalArgumentException(message); return (T) t; }/*w w w. j av a2 s. c om*/ }