Java JAASの利点と限界

import javax.security.auth.Subject;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;

public class JAASDemo {

public static void main(String[] args) {
// Create a LoginContext object
LoginContext loginContext = new LoginContext("LoginModule");

// Login the user
try {
loginContext.login();
} catch (LoginException e) {
System.out.println("Failed to login: " + e.getMessage());
return;
}

// Get the Subject object
Subject subject = loginContext.getSubject();

// Print the subject"s principals
System.out.println("Subject principals:");
for (Principal principal : subject.getPrincipals()) {
System.out.println(principal.getName());
}

// LoGout the user
try {
loginContext.logout();
} catch (LoginException e) {
System.out.println("Failed to logout: " + e.getMessage());
}
}
}