Here you can find the source of assertNotNull(T value, String message)
public static <T> T assertNotNull(T value, String message)
//package com.java2s; /**// w w w. ja v a2 s. c o m * Copyright (c) 2009 - 2012 Red Hat, Inc. * * This software is licensed to you under the GNU General Public License, * version 2 (GPLv2). There is NO WARRANTY for this software, express or * implied, including the implied warranties of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2 * along with this software; if not, see * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. * * Red Hat trademarks are not licensed under GPLv2. No permission is * granted to use or replicate Red Hat trademarks that are incorporated * in this software or its documentation. */ public class Main { public static <T> T assertNotNull(T value, String message) { if (value == null) { throw new IllegalArgumentException(message); } return value; } }