What is a HAR file?
A Hibernate Archive (or HAR for short) is packaged like a normal JAR file, but
it has some special properties. It contains a META-INF/jboss-service.xml
file which tells JBoss how to initialize
Hibernate. Besides starting up a session
factory and setting up some other useful features, JBoss also verifies that
the database tables are up to date. To do this, JBoss needs the hibernate
mappings and their corresponding class files. Those files are included in