Then,   How will my application know that user is already logged in to the
system?  The way we've to check is shown below?    MyCredentialsRealm  realm
= new MyCredentialsRealm();           DefaultSecurityManager securityManager
= new DefaultSecurityManager(realm);            SimplePrincipalCollection
identity = new SimplePrincipalCollection(user.getUsername(), "realm");       
Subject subject = new
Subject.Builder(securityManager).principals(identity).buildSubject();      
// subject.hasRole("ADMIN");                     if
(!subject.isAuthenticated()) {            System.out.println("Is going to
log in to the system");        } else System.out.println("already logged
in");Please advise.



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