Nicht zum erstellen von verwalteten bean UserBean - JSF

Ich versuche, erstellen Sie eine einfache login-Seite für den Zugriff auf einen DB, so dass, wenn Benutzername und Passwort werden überprüft, die id, firstName, lastName werden in der Klasse sowie für den Zugang. Ich bekomme diese Fehlermeldung, obwohl:

javax.servlet.ServletException: Unable to create managed bean UserBean.  The following problems were found:
 - Property firstName for managed bean UserBean does not exist.  Check that appropriate getter and/or setter methods exist.
 - Property id for managed bean UserBean does not exist.  Check that appropriate getter and/or setter methods exist.
 - Property lastName for managed bean UserBean does not exist.  Check that appropriate getter and/or setter methods exist.
javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)

Habe ich Getter für id, firstName, lastName, aber keine setter, weil Sie nach der Validierung.

Hier ist Klasse UserBean

public class UserBean {
private static String password, username, id, firstName, lastName;
public enum DBfields { BLANK, USERNAME, ID, PASSWORD, FIRSTNAME, LASTNAME }; 

public String getPassword() {
    return password;
}

public void setPassword( String value ) {
    password = value;
}

public String getUsername() {
    return username;
}

public void setUsername( String value ) {
    username = value;
}

public static String getId() {
    return id;
}

public static String getFirstname() {
    return firstName;
}

public static String getLastname() {
    return lastName;
}

public String loginUser() throws Exception { 

    if( loginValidate( username, password ) )
        return "success";
    else
        return "fail";
}

public static boolean loginValidate( String username, String Password ) throws Exception{

    String DBuser;
    String DBpass = "asdf";
    PreparedStatement table = connectToTable( "firstsql", "users");
    ResultSet row = table.executeQuery();;

    while(row.next()){
        DBuser = row.getString(DBfields.USERNAME.name());
        if(username.equals(DBuser)){
            DBpass = row.getString(DBfields.PASSWORD.name());
            break;
        }
    }

    if(password.equals(DBpass)){
        id = row.getString(DBfields.ID.name());
        firstName = row.getString(DBfields.FIRSTNAME.name());
        lastName = row.getString(DBfields.LASTNAME.name());
        return true;
    } else
        return false;
}

und meine faces-config

 <?xml version="1.0" encoding="UTF-8"?>
<faces-config version="2.0" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xi="http://www.w3.org/2001/XInclude"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd">
 <managed-bean>
  <managed-bean-name>UserBean</managed-bean-name>
  <managed-bean-class>com.jfsdemo.bean.UserBean</managed-bean-class>
  <managed-bean-scope>request</managed-bean-scope>
  <managed-property>
   <property-name>firstName</property-name>
   <property-class>java.lang.String</property-class>
   <value/>
  </managed-property>
  <managed-property>
   <property-name>id</property-name>
   <property-class>java.lang.String</property-class>
   <value/>
  </managed-property>
  <managed-property>
   <property-name>lastName</property-name>
   <property-class>java.lang.String</property-class>
   <value/>
  </managed-property>
  <managed-property>
   <property-name>password</property-name>
   <property-class>java.lang.String</property-class>
   <value/>
  </managed-property>
  <managed-property>
   <property-name>username</property-name>
   <property-class>java.lang.String</property-class>
   <value/>
  </managed-property>
 </managed-bean>
 <navigation-rule>
  <from-view-id>/login.xhtml</from-view-id>
  <navigation-case>
   <from-action>#{UserBean.loginUser}</from-action>
   <from-outcome>success</from-outcome>
   <to-view-id>/timesheet.xhtml</to-view-id>
  </navigation-case>
  <navigation-case>
   <from-action>#{UserBean.loginUser}</from-action>
   <from-outcome>fail</from-outcome>
   <to-view-id>/login.xhtml</to-view-id>
  </navigation-case>
 </navigation-rule>
 <navigation-rule>
  <from-view-id>/timesheet.xhtml</from-view-id>
 </navigation-rule>
</faces-config>