Store file content instead of file object

Hibernate - Name query to improve the performance

http://www.mkyong.com/hibernate/hibernate-native-sql-queries-examples/
http://stackoverflow.com/questions/13607337/hibernate-query-for-selecting-multiple-values

Hibernate – Many-to-Many example – join table + extra column (Annotation)

http://www.mkyong.com/hibernate/hibernate-many-to-many-example-join-table-extra-column-annotation/