JSF EL Expressions and Java beans - jsf

Question

I have a JSF project and I am trying to create a login page, I have managed to get the username and password from the database and validate them, my project has a Java bean, managed bean and DAO classes, when the user successfully logs in, I would like to print Hello Mr.
< h:outputLabel value="#{mBLogin.user.firstName}" /> the Hello Mr. is printing but the name is not, although when testing my DAO class I'm printing the name to the console without any problem! Can someone advice what I am doing wrong?
My managed bean class:
#ManagedBean
#SessionScoped
public class MBLogin {
User user = new User();
LoginDAO loginDao = new LoginDAO();
public String validteStudent() {
boolean valid = loginDao.validateStudent(user.getUserId(), user.getPassword());
if (valid) {
user.getFirstName();
HttpSession session = SessionUtils.getSession();
session.setAttribute("username", user);
return "admin";
} else {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_WARN,
"Incorrect Username and Passowrd", "Please enter correct username and Password"));
return "login";
}
}
public void setUser(User user) {
this.user = user;
}
public User getUser() {
return user;
}
}
My Java Bean class:
#Table(name = "students_info")
public class User {
#Column(name = "std_record_id")
private int id;
#Column(name = "std_id")
private String userId;
#Column(name = "first_name")
private String firstName;
#Column(name = "last_name")
private String lastName;
#Column(name = "web_password")
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
My DAO class :
public class LoginDAO {
static JKPlainDataAccess dataAccess = JKDataSourceFactory.getPlainDataAccess();
User user;
public boolean validateStudent(String userName, String password) {
user = dataAccess.executeQueryAsSingleObject(User.class, "id,userId,firstName,lastName,password",
"SELECT std_record_id, std_id, first_name, family_name, web_password From students_info WHERE std_id=? and web_password=?",
userName, password);
JK.print("getAllEmployeeRecords() : ", user);
if(user != null) {
System.out.println(user.getFirstName());
System.out.println(user.getLastName());
return true;
}
return false;
}
public static void main(String[] args) {
LoginDAO a = new LoginDAO();
a.validateStudent("200663042001", "1234");
}
}
my xhtml page after the login page:
<ui:composition template="/WEB-INF/layouts/default.xhtml">
<ui:define name="content">
WELCOME Mr. <h:outputLabel value="#{mBLogin.user.firstName}" />
AND <h:outputLabel value="#{mBLogin.user.lastName}" />
</ui:define>
</ui:composition>

Answer 1

When validating, you seem to put the user as the session attribute without assigning it to the Managed Bean field:
session.setAttribute("username", user);
So either assign it also to the instance user variable or simply use:
<ui:composition template="/WEB-INF/layouts/default.xhtml">
<ui:define name="content">
WELCOME Mr. <h:outputLabel value="#{username.firstName}" />
AND <h:outputLabel value="#{username.lastName}" />
</ui:define>
</ui:composition>
Update
I would suggest changing your service method to:
public User validateStudent(..)
where you actually return the queried user instead of setting it in the DAO..
And thus you would change the ManagedBean method to:
public String validteStudent() {
User validatedUser = loginDao.validateStudent(user.getUserId(), user.getPassword());
if (validatedUser != null) {
this.user = validatedUser;
HttpSession session = SessionUtils.getSession();
session.setAttribute("username", user);
....