jar file - changes are not saved in application

[edsporty]

I have my jar file which executes as expected.
But after I make changes in the application (for example changing a person's name) and I close it and open it again the changes are not there.
It's like a new version of the application is run every time I open the jar.
Is there a something I have to do so the changes can be saved?

Thanks

[Eranga]

Which jar you've execute and what and where you've done changes? Which application are you talking about?

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