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    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
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  import org.apache.shiro.SecurityUtils;
  import org.apache.shiro.authc.*;
  import org.apache.shiro.config.IniSecurityManagerFactory;
  import org.apache.shiro.mgt.SecurityManager;
  import org.apache.shiro.session.Session;
  import org.apache.shiro.subject.Subject;
  import org.apache.shiro.util.Factory;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * Simple Quickstart application showing how to use Shiro's API.
   *
   * @since 0.9 RC2
   */
  public class Quickstart {
  
      private static final transient Logger log = LoggerFactory.getLogger(Quickstart.class);
  
  
      public static void main(String[] args) {
  
          // The easiest way to create a Shiro SecurityManager with configured
          // realms, users, roles and permissions is to use the simple INI config.
          // We'll do that by using a factory that can ingest a .ini file and
          // return a SecurityManager instance:
  
          // Use the shiro.ini file at the root of the classpath
          // (file: and url: prefixes load from files and urls respectively):
          Factory<SecurityManager> factory = new IniSecurityManagerFactory("classpath:shiro.ini");
          SecurityManager securityManager = factory.getInstance();
  
          // for this simple example quickstart, make the SecurityManager
          // accessible as a JVM singleton.  Most applications wouldn't do this
          // and instead rely on their container configuration or web.xml for
          // webapps.  That is outside the scope of this simple quickstart, so
          // we'll just do the bare minimum so you can continue to get a feel
          // for things.
          SecurityUtils.setSecurityManager(securityManager);
  
          // Now that a simple Shiro environment is set up, let's see what you can do:
  
          // get the currently executing user:
          Subject currentUser = SecurityUtils.getSubject();
  
          // Do some stuff with a Session (no need for a web or EJB container!!!)
          Session session = currentUser.getSession();
          session.setAttribute("someKey", "aValue");
          String value = (String) session.getAttribute("someKey");
          if (value.equals("aValue")) {
              log.info("Retrieved the correct value! [" + value + "]");
          }
  
          // let's login the current user so we can check against roles and permissions:
          if (!currentUser.isAuthenticated()) {
              UsernamePasswordToken token = new UsernamePasswordToken("lonestarr", "vespa");
              token.setRememberMe(true);
              try {
                  currentUser.login(token);
              } catch (UnknownAccountException uae) {
                  log.info("There is no user with username of " + token.getPrincipal());
              } catch (IncorrectCredentialsException ice) {
                  log.info("Password for account " + token.getPrincipal() + " was incorrect!");
              } catch (LockedAccountException lae) {
                  log.info("The account for username " + token.getPrincipal() + " is locked.  " +
                          "Please contact your administrator to unlock it.");
              }
              // ... catch more exceptions here (maybe custom ones specific to your application?
              catch (AuthenticationException ae) {
                  //unexpected condition?  error?
              }
          }
  
          //say who they are:
          //print their identifying principal (in this case, a username):
          log.info("User [" + currentUser.getPrincipal() + "] logged in successfully.");
  
          //test a role:
          if (currentUser.hasRole("schwartz")) {
             log.info("May the Schwartz be with you!");
         } else {
             log.info("Hello, mere mortal.");
         }
 
         //test a typed permission (not instance-level)
         if (currentUser.isPermitted("lightsaber:wield")) {
             log.info("You may use a lightsaber ring.  Use it wisely.");
         } else {
             log.info("Sorry, lightsaber rings are for schwartz masters only.");
         }
 
         //a (very powerful) Instance Level permission:
         if (currentUser.isPermitted("winnebago:drive:eagle5")) {
             log.info("You are permitted to 'drive' the winnebago with license plate (id) 'eagle5'.  " +
                     "Here are the keys - have fun!");
         } else {
             log.info("Sorry, you aren't allowed to drive the 'eagle5' winnebago!");
         }
 
         //all done - log out!
         currentUser.logout();
 
         System.exit(0);
     }
 }