First you should make sure all 3rd partyd dependencies (e.g. Libraries that your jar needs) are ~visible~ to your application (e.g. Reside on classpath and/or -Djava.library. Path ). Next, you should just instantiate classes/call methods from your jar file normally and operate with returned objects as its been locally created by your Java application.
Jar file is just an external library that becomes the part of your application upon loading.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.