With Mongo-Realm you can store your users credentials directly in MongoDB with other data of your applicaton. Forget about setting up separate MySQL or LDAP server only for storing users data.

1. download mongo-realm jar and put it in your glassfish domains lib folder (i.e. $GLASSFISH_HOME/glassfish/domains/$DOMAINNAME/lib/)
2. at the end of $GLASSFISH_HOME/glassfish/domains/$DOMAINNAME/config/login.conf file paste:

mongoRealm { 
  com.tadamski.glassfish.mongo.realm.MongoLoginModule required; 
};

3. create realm in glassfish using asadmin tool

asadmin create-auth-realm --classname com.tadamski.glassfish.mongo.realm.MongoRealm --property jaas-context=mongoRealm $REALM_NAME

4. configure your applicaton to use newly created realm (in most cases few lines in web.xml will be enough)

By default:

Mongo-Realm connects to localhost on 27017 and looks for data in users database in users collection. Informations about users are stored in separate documents [one user = one document]. Each document contains login, password simple string properties and groups with array of group names user belongs to. All passwords are hashed using SHA-512 function.

Salt property is appended to the password before hashing. For users without salt, it will be generated on the first login.

Custom configuration:

Of course defaults can be overriden. Simply add properties to realm created in 3rd step of Setup.