Why does JSF form preserve values? - jsf-2

Question

Here is backing bean of my log in page. Why does it preserve values after calling the logIn() method? I mean after I submit the form and return to the login page my previously entered username is already there. I thought that by using #RequestScoped annotation the values are not preserved.
#Controller
#ManagedBean
#RequestScoped
public class LogInBean implements Serializable {
private static final long serialVersionUID = 2092611147930386873L;
#Autowired
private UserService userService;
private String username;
private String password;
private boolean rememberMe;
public String logIn() {
return "index?faces-redirect=true";
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public boolean isRememberMe() {
return rememberMe;
}
public void setRememberMe(boolean rememberMe) {
this.rememberMe = rememberMe;
}
}

Answer 1

It's because you're actually using an application scoped Spring managed bean instead of a request scoped JSF managed bean.
Your main mistake is that you're mixing JSF bean management annotations with a Spring bean management annotation and somehow are expecting that they seamlessly understand each other.
#Controller
#ManagedBean
#RequestScoped
This is thus not true. You effectively end up with two completely independent managed bean instances, one managed by JSF and another managed by Spring. The #RequestScoped annotation is specific to JSF bean management facility. The Spring's equivalent, #Scope("request") is absent and therefore the Spring managed bean defaults to the application scope. When referencing the bean in EL scope like so #{logInBean}, the Spring managed one gets precedence over JSF managed one because of the Spring bean EL resolver and you ultimately end up with an application scoped Spring managed bean. This totally explains the symptoms.
Fix it accordingly by getting rid of JSF bean management annotations and placing the desired Spring scope annotation:
#Controller
#Scope("request")
(an alternative would be to get rid of Spring bean management annotation and replace #Autowired by #EJB, like as one would normally do when using standard Java EE stack without any 3rd party library)
If you still face this problem, then another possible cause would be that you're submitting the login synchronously while not having autocomplete="off" on the input fields, head to this Q&A then: Disable web browser password save.