Watch Explanation on YouTube
How to create deadlock using static final variables in java
Link URL : https://youtu.be/p0HNCppq80A
Code
If you run the below code, public static void main method, the code execution will result in a deadlock.
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public class Singleton {
public static final int TIMEOUT = getValue();
private static int getValue() {
return 10;
}
private static final Singleton INSTANCE = new Singleton();
private Singleton() {
synchronized (this) {
Thread thread = Thread.currentThread();
while (thread.isAlive()) {
try {
wait(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static Singleton instance() {
return INSTANCE;
}
@Override
public String toString() {
return "Singleton{}";
}
}
class SomeClass {
public static void main(String[] args) {
new Thread(() -> System.out.println("the timeout value is " + Singleton.TIMEOUT)).start();
new Thread(() -> System.out.println("instance received " + Singleton.instance())).start();
}
}