问不推荐使用'java.io.ObjectOutputStream' - Intellij IDEA中的错误？

EN

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.Date;

public class EmployeeProcessor {
    public static void main(String[] args) {
        Employee employee = new Employee();
        employee.lastName = "Smith";
        employee.firstName = "Adam";
        employee.id = 123456789;
        employee.salary = 50000;

        try(FileOutputStream fileOutStr = new FileOutputStream("Employee.ser");
            ObjectOutputStream objectOutStr = new ObjectOutputStream(fileOutStr)) {

            objectOutStr.writeObject(employee);
            System.out.println("An employee is externalized into the file Employee.ser");

        } catch (IOException ioError){
            ioError.printStackTrace();
        }
    }
}