Welcome to the Ranch, Mohamed!
Those are messages from NetBeans and from the application builder that NetBeans used to create the application to
test.
They will NOT appear when you run the application stand-alone (without NetBeans) as you would in a production environment.
As a rule, you DO want to see those messages, since if you have problems getting the app to run, they'll tell you why.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.