Topic: Equivalent to Rails Migrations in JPA?

I'm getting into a J2EE project based on the EclipseLink implementation of JPA. I'm finding it somewhat similar to Rails, most of the major frameworks apply a basic MVC style architecture, separating the data from the logic from the display.

I'm doing some significant changes at the model/entity level and need to drop a few columns and migrate their data to a new structure. In Rails I would do this in a migration, is there an equivalent to this in JPA??