What i know about jar file is that it is not stored into database. If you are using windows application then .bat file or if you are using linux then .sh file, a reference is set for that particular jar files to execute the program.
Like i have number of jar files and all that files are lying into my application's subfolder called "JAR".
Here is the example for your reference. i am using linux
Love is GOD and GOD is Love.
M/s. Anand Karia Concreting IT