JEP 477: println blocking

[Adam Sotona]

Hi,
I’m updating my classroom examples to run on JDK 23 and with IO.println I experience different behavior than with System.out.println. Following example explains the issue.

Thank you,
Adam

static void doSomething() {
    try {
        Thread.sleep(1000);
    } catch (InterruptedException ignore) {}
}

void main() {
    Thread.ofVirtual().start(() -> {
        while (true) {
            doSomething();
            System.out.println("I do something until you press Enter");
        }
    });
    Thread.ofVirtual().start(() -> {
        while (true) {
            doSomething();
            println("I'm blocked until you press Enter");
        }
    });
    readln("");
}


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