I am using JBoss seam to make a small project-oriented database I have an entity that I would like to change, add or remove properties
but how can I do for the changes is automatic in the database
and columns of the table corresponding changes automatically
This is really a Hibernate question, but you should set a property in persistence.xml which does the work or you.
<property name="hibernate.hbm2ddl.auto" value="update" />
The value can also be create or create-drop.