How to deal with database initialization?

As also described here, I'm trying to determine the best way to initialize and update my application's database. I use EclipseLink-JPA2. I distribute a NetBeans platform application.

Considered options:

• use create-tables ddl-generation: The problem with this is that everytime the application runs it will throw exceptions, failing to create the tables. It will be useful only at setup time. This would be similar to placing checking code in the module restored() method.

• include the database with 开发者_如何学编程the application distribution: the ddl-generation strategy becomes do nothing. I could still use the JPA (at development time) to generate the database files (embedded Java DB).

The best solution would be for the installer/setup (first-time) to call initializing code that creates the database. This precisely what I do with JWS in here. But I don't know how to do that without JWS. A script/jar executed by the installer?

Distribute your NetBeans Platform application via JWS.

It seems like you already have this problem sorted out with JWS, so just use that solution to deploy your NetBeans platform app.

EDIT

An alternative approach would be to use a Module Installer that checks for the existence of a config file. If the file exists then the application has been run before and the setup is not required. If the file doesn't exist then run your setup steps. Have a look at this tutorial, they're using a module installer to create a login dialog.