A transient final field used as a lock is null

Question

The following code throws a NullPointerException.

import java.io.*;

public class NullFinalTest {
    public static void main(String[] args) thr         


        

Answer 1

A transient final field used as a lock is null

Here are few facts about the transient variable:

- Transient keyword when used on an instance variable, will prevent that instance variable to be serialized.

- On De-serialization, the transient variable get to their Default values.....

Eg:

• Object Reference Variable to null
• int to 0
• boolean to false, etc.......

So thats the reason you are getting a NullPointerException, when deserializing it...