EJB3: What is the easiest way to handle the rapid change DB structure?

Hi,
I'm new in EJB, and it's the biggest leap to learn EJB3 without having strong fundamental in EJB 2.Currently, I'm facing the inefficient way to handle database rapid change on my Web Application. I choose JSP, Struts, and EJB3 with Oracle Database 10.1.0.5, Oracle Application Server 10.1.3.1, Oracle JDeveloper 10.1.3.2.
I've followed tutorial how to make EJB3 Entity Bean, and how to access EJB Session Bean from JSP. But in that tutorial, there is no clue how to manage or change Entity Bean if there is a change in table structure, let say add 2 new fields, and change 1 field type from VARCHAR to NUMBER..
What has been done was I create a new EJB3 project, and build all new Entity Bean. All generated JAVA file is copied and pasted to my current Entity Bean file.
Is there any other easiest and simplest way to handle the rapid change in development process? As I noticed that EJB 3 using TopLink to handle Entity Bean creation process, but i haven't found articles or tutorial how to deal with my problem.
Thanks..

Unfortunately there is no automatic way to do this with EJB right now. You'll basically need to go into your entity bean and add/change the attribute to match the new database column.
Note that we do provide automatic synchronization or the ADF Business Components framework - in case you choose to use it instead of EJB 3.0.
Also if you are just starting your development/learning I think you might want to use JSF and not Struts. Seems like JSF has a much better future then Struts.

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EJB3: What is the easiest way to handle the rapid change DB structure?

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