jsp servlet coding issue

hi, i am making a library system project in java,but i am facing problem in my code just see the code below.

//thats a User class which have common variable of Library and Student.i made a register and login method in User class.

public class User{

private Integer userId;

private UserType userType;

private String name;

private String emailId;

private String password;

when the user login for first time he has to fill details but there is a problem how can i instantiate Library class and how can i get the values from database.

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