Is database Engine necessary or should I use one in my Java application?

I am writing a program which similar to a telephone
directory kind of application. I have a database and
I am thinking to use JDBC with mySQL for the
database.
My question is that later when this program is ready
and I am going to burn it to CD, what will be happen
with mySQL? Can I add mySQL (or a similar program)?You can, but will users want that? Are you better off allowing users to work with any relational database they wish?
>
Is it not better to make a database by Java objects
or arrays within Java? Unless you plan on writing a relational database and SQL engine on your own, the best bet is to get a real relational database.
Hypersonic SQL is small and embeddable in Java. Cloudscape might be good, too. Derby is going to be part of Java 6, unfortunately. PostgreSQL is a terrific relational database that's free.
What is the smart way to this
when it comes to a program which in the background
you have database??? Thank you for sharing your
expertise...The smart thing is to get a real relational database and forget about doing it yourself. Databases are far more complex than a few arrays or objects.
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Is database Engine necessary or should I use one in my Java application?

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