Hi,
There is a PropertiesLoginModule preinstalled in Talend Runtime/karaf container which can be used to do auth for your application.
karaf@trun> jaas:realms
Index Realm Module Class
1 karaf org.apache.karaf.jaas.modules.properties.PropertiesLoginModule
you can manage this karaf realm from console commands:
karaf@trun> jaas:
jaas:cancel jaas:manage jaas
ending jaas:realms jaas:roleadd jaas:roledel jaas:update
jaas:useradd jaas:userdel jaas:users
also, you could find user/pwd info directly from etc/users.properties
HTH