Java Prepared statement not executing

Question

I have created a small 3 tier program, consisting of : front end -> servlet -> database.

Front end I enter some details into a form. They are passed to a servlet, which

Answer 1

Also, why st = con.createStatement();?

And why do you have a leading space in your query?

String query = " INSERT INTO user_information (name, email, country, password)" 
                 + " VALUES (?, ?, ?, ?)";

This leading space may or may not matter...

Lastly, you should be closing your connection when you're through with it, using try-with-resources or a finally block.