Main.java

public class Main {
    public static ThreadLocal<String> threadLocal = new InheritableThreadLocal<>();

    public static void main(String[] args) throws InterruptedException {
        threadLocal.set("monamona");
        Thread t1 = Thread.builder().inheritThreadLocals().virtual().task(() -> {
            System.out.println("foo pre:" + threadLocal.get());
            threadLocal.set("foo");
            foo();
        }).start();
        Thread t2 = Thread.startVirtualThread(() -> {
            System.out.println("bar pre:" + threadLocal.get());
            threadLocal.set("bar");
            foo();
        });

        Thread t3 = Thread.builder().task(() -> {
            System.out.println("hoge pre:" + threadLocal.get());
            threadLocal.set("hoge");
            foo();
        }).start();

        Thread t4 = new Thread(() -> {
            System.out.println("t4 pre:" + threadLocal.get());
            threadLocal.set("t4");
            foo();
        });
        t4.start();

        t1.join();
        t2.join();
        t3.join();
        t4.join();
    }


    static void foo() {
        bar();
    }

    static void bar() {
        try {
            Thread.sleep(3000);
            throw new RuntimeException("hogehoge:" + threadLocal.get());
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

output.txt

hoge pre:null
t4 pre:monamona
foo pre:monamona
bar pre:null
Exception in thread "Thread-1" Exception in thread "Thread-0" java.lang.RuntimeException: hogehoge:t4
	at com.example.Main.bar(Main.java:46)
	at com.example.Main.foo(Main.java:40)
	at com.example.Main.lambda$main$3(Main.java:28)
	at java.base/java.lang.Thread.run(Thread.java:1676)
java.lang.RuntimeException: hogehoge:hoge
	at com.example.Main.bar(Main.java:46)
	at com.example.Main.foo(Main.java:40)
	at com.example.Main.lambda$main$2(Main.java:22)
	at java.base/java.lang.Thread.run(Thread.java:1676)
Exception in thread "<unnamed>" Exception in thread "<unnamed>" java.lang.RuntimeException: hogehoge:foo
	at com.example.Main.bar(Main.java:46)
	at com.example.Main.foo(Main.java:40)
	at com.example.Main.lambda$main$0(Main.java:11)
	at java.base/java.lang.VirtualThread.lambda$new$0(VirtualThread.java:122)
	at java.base/java.lang.Continuation.enter(Continuation.java:380) VirtualThreads
	at java.base/java.lang.Continuation.run(Continuation.java:337)
	at java.base/java.lang.VirtualThread.runContinuation(VirtualThread.java:206)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1429)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1018)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1667)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1600)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:189)
java.lang.RuntimeException: hogehoge:bar
	at com.example.Main.bar(Main.java:46)
	at com.example.Main.foo(Main.java:40)
	at com.example.Main.lambda$main$1(Main.java:16)
	at java.base/java.lang.VirtualThread.lambda$new$0(VirtualThread.java:122)
	at java.base/java.lang.Continuation.enter(Continuation.java:380) VirtualThreads
	at java.base/java.lang.Continuation.run(Continuation.java:337)
	at java.base/java.lang.VirtualThread.runContinuation(VirtualThread.java:206)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1429)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1018)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1667)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1600)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:189)