Here you can find the source of logout()
public static synchronized void logout() throws LoginException
//package com.java2s; /**//from w w w. ja v a 2s . c o m * Copyright (C) 2009 BonitaSoft S.A. * BonitaSoft, 31 rue Gustave Eiffel - 38000 Grenoble * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2.0 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import javax.security.auth.login.LoginContext; import javax.security.auth.login.LoginException; public class Main { private static LoginContext loginContext; public static synchronized void logout() throws LoginException { if (loginContext != null) { loginContext.logout(); loginContext = null; } else { throw new LoginException("You must login before trying to log out!"); } } }