Debug: if else structure when object is return type of class

Error :This method must return a result of type UserBean

public UserBean isUserExist(String username)
{
UserBean objUserBean= new UserBean();
boolean found=false;
ArrayList users= (ArrayList)application.get("users");
if(users !=null)
{
Iterator it=users.iterator();
while(it.hasNext())
{
objUserBean=(UserBean)it.next();
if(objCommonBean.equals(objUserBean.getUsername()))
found=true;
break;
}

if(found)
return objUserBean;

}
else
return null;
}

}

Solution
One solution is
 either avoid else and directly write return null ( i don't know why)

public UserBean isUserExist(String username)
{
UserBean objUserBean= new UserBean();
boolean found=false;
ArrayList users= (ArrayList)application.get("users");
if(users !=null)
{
Iterator it=users.iterator();
while(it.hasNext())
{
objUserBean=(UserBean)it.next();
if(objCommonBean.equals(objUserBean.getUsername()))
found=true;
break;
}

if(found)
return objUserBean;

}

return null;
}

}


Other Solution is :somewhat understandable


public UserBean isUserExist(String username)
{
UserBean objUserBean= new UserBean();
boolean found=false;
ArrayList users= (ArrayList)application.get("users");
if(users !=null)
{
Iterator it=users.iterator();
while(it.hasNext())
{
objUserBean=(UserBean)it.next();
if(objCommonBean.equals(objUserBean.getUsername()))
found=true;
break;
}

if(found)
return objUserBean;

}

else
  return null;
            return objUserBean;
          }

}