authtest.java

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import java.security.*;
import javax.security.auth.*;
import javax.security.auth.login.*;

/**
   This program authenticates a user via a custom login and then executes the SysPropAction
   with the user's privileges.
*/
public class AuthTest
{
   public static void main(final String[] args)
   {
      try 
      {
         System.setSecurityManager(new SecurityManager());
         LoginContext context = new LoginContext("Login1");
         context.login();
         System.out.println("Authentication successful.");
         Subject subject = context.getSubject();
         System.out.println("subject=" + subject);
         PrivilegedAction action = new SysPropAction("user.home");
         Object result = Subject.doAsPrivileged(subject, action, null);
         System.out.println(result);
         context.logout();
      } 
      catch (LoginException e) 
      {
         e.printStackTrace();
      }      
   }
}