Demo môn học
Some helpfull fix error if you need.
// Using Connector/J with GlassFish https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-usagenotes-glassfish-config.html
// java.lang.NoSuchMethodError: org.jboss.logging.Logger.debugf(Ljava/lang/String;I)V http://stackoverflow.com/a/39143291/4498952?sfb=2