Here you can find the source of assertInputNotEmpty(final String input, final String message)
public static String assertInputNotEmpty(final String input, final String message)
//package com.java2s; //License from project: Apache License public class Main { public static String assertInputNotEmpty(final String input, final String message) { if (input == null || input.isEmpty()) { throw new IllegalArgumentException(message); }// w w w . j a va2 s . co m return input; } }