ThreadLocal and CompletableFuture

ThreadLocalTest.java

package com.example;

import org.junit.Test;

import java.util.concurrent.CompletableFuture;

public class ThreadLocalTest {

    @Test
    public void name() {
        ThreadLocal<Integer> threadLocal = new ThreadLocal<>();
        threadLocal.set(10);
        System.out.println(10);
        System.out.println(Thread.currentThread());

        CompletableFuture.supplyAsync(threadLocal::get)
            .thenApplyAsync((i) -> {
                System.out.println(Thread.currentThread());
                System.out.println(i);
                int value = i + 10;
                threadLocal.set(value);
                return value;
            })
            .thenAccept((i) -> {
                System.out.println(i);
            })
            .join();
    }
}

This fails on L#20. NullPointerException as threadLocal::get returns null.
Did you share this test case just to prove failure OR it works for you?

Hi @TheKSoni sorry but this gist was posted 1.5 years ago, I don't even remember where. Can you remind me?

I couldn't find it in your public repositories. I can only see it here in your gist.

Yeah but how come you stumbled on this gist? Is it linked in some bug report, or have you just googled?