How to package database file with application jar file for distribution purpose

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Java

I have successfully created a desktop software that requires database for usage. I created the project and database with netbeans using the embedded derby driver. I have clean and build the software it's now a jar file. I have a package installer software (Advanced Installer) which helps to convert the jar file the an .exe file

The Question is:
The database I created which is located in my user.home directory how can I attached that file to the application so when ever the user install my software the database file will be added to the user.home directory too (because that's where I told java to locate the database) please I really need help my software is useless without database

What I have tried:

I have been trying to add the database file to the application jar files but if I do that java wouldn't know where to locate the database because i have written code to locate database at the user.home directory (C:\Users\john\mydatabase). I can write code to locate the database where the software will be saved (C:\Programm Files (x86)\MySoftwear but that directory will only work on windows which is not ok because I want the application to work on both windows and Mac Linux e.t.c