User.java

package com;

/**
 * Created by adelin.ghanayem@cayetanogaming.com on 2/16/16.
 */
public final class User {
    
    
    private final String name;
    private final boolean isActive;
    private final String userId;
    
     
    // can be constructed using this constructor ONLY ! 
    public User(String name, boolean isActive, String userId) {
        this.name = name;
        this.isActive = isActive;
        this.userId = userId;
        this.address = address;
    }

    public String getName() {
        return name;
    }

    public boolean isActive() {
        return isActive;
    }

    public String getUserId() {
        return userId;
    }
}

this.address = adress; should be deleted as well.