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Because when a developer add new EJB to a project it denotes maintenance (or evoution), there is no need to create a new dbschema to maintain new tables (because this will lead into importing same tables again, when they already imported before). So, when developer ask "File -> New... Entity Classes from Database" for second time on same project, where already exists a dbschema, and developer ask to use a jdbc connection, if it's same dbconnection of a existing dbschema, that dbschema should be upgraded, not created a new one.