after an insert in the DB, the application doesn't show it

I am learning JEE and I am facing an issue.

Using HeidiSQL, I add a new line to an user table.

I then go to the deployed application that can lists all the users. When I show them all, the new user isn't shown in the list.

I am using Entity and JPA. I have to deploy my application again (even if I didn't do any change) to show the new user.

Is there a way to force the data to "enter" in the deployed app ?

Thank you for your answers