java - Apache Derby DB not working when I close NetBeans IDE

Question

I am a beginner to Java and Databases.
Recently, i have been developing a Java Application where I am using derby database. When I start NetBeans and run the project it works fine. But when I close the IDE and run the .JAR file it does not not work. Can anybody tell me the reason behind it?

Answer 1

Netbeans is running Apache Derby for you in a networked mode, and your application is connecting to it. When netbeans is not running, then the database is not running either, so it's not available to your application.

If you want your application to run w/o a being able to reach a database over a network, your application must be changed to run Derby in embedded mode.

If you want your application to run connected to a networked version of Derby, you will need to arrange to run Derby somewhere that your application can connect to it.