Error of missing return statement while implementing Array

hi all.
this is my first post in here.
i have problem in return type but :-?? can help me ?

this is my code :

Code :

public ArrayList<Operator> getlist() throws ClassNotFoundException, SQLException{
 
        ArrayList<Operator> operators = null;
        Operator operator= null;
        Command_msg = "SELECT * FROM Operator";
 
              connection = DBCore.Conn();
            statement = connection.createStatement();
            ResultSet rs = statement.executeQuery(Command_msg);
            operators = new ArrayList<Operator>();
            while(rs.next()){
                operator = new Operator();
                operator.setUsername(rs.getString("Username"));
                operator.setPassword(rs.getString("Password"));
                operator.setName(rs.getString("Name"));
                operators.add(operator);
 
        return operators;

and

Code :

 
    //create object From Operator
    private Operator operator;
 
    //create array of Operators
    private Operator[] operators;

know the error is : missing return Statement