The serializable class does not declare a static final serialversionuid field of type long

Question

Problem :

I am having following warning message.

“The serializable class does not declare a static final serialversionuid field of type long”

I would like to understand and resolve the issue. Can somebody explain me this issue with simple words? I know what OOPs is

Please find below my code for your reference :

import java.awt.*;

import javax.swing.*;

public class HelloSwing extends JFrame {

JTextArea m_resultArea = new JTextArea(6, 30);

public HelloSwing() {

//... Set initial text, scrolling, and border.

m_resultArea.setText("Enter some more text to see scrollbars");

JScrollPane scrollingArea = new JScrollPane(m_resultArea);

            scrollingArea.setBorder(BorderFactory.createEmptyBorder(10,5,10,5));

// Get the content pane, set layout, add to center

Container content = this.getContentPane();

content.setLayout(new BorderLayout());

content.add(scrollingArea, BorderLayout.CENTER);

this.pack();

        }

public static void createAndViewJFrame() {

JFrame win = new HelloSwing();

win.setTitle("TextAreaDemo");

            win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

win.setVisible(true);

}

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable(){

public void run(){

createAndViewJFrame();

                }

            });

        }

}

Answer 1

Please find below the solution on your problem :

You can configure your IDE in two ways:

·To ignore the error message instead of giving a warning.

·To auto generate an id

It can cause the problem only if you are serializing objects and deserializing them in a different place OR time where the class has changed, and it will not result in freezing, but in InvalidClassException