You then have a couple of options for accessing the Derby database from your deployed application.
The page should process the submission, and you should see your comments appear in the table.
Check the database table using the table editor; you should find that the comments have been saved there.
Creating database-driven web applications in Java has traditionally involved a steep learning curve.
Even if you already know how to write Java programs, and have a basic understanding of web applications, the Java Enterprise Edition (Java EE) stack is daunting.