java - 尝试进入同步块(synchronized block)时出现 IllegalStateException

Question

进入同步块(synchronized block)时抛出IllegalStateException是什么意思？我有时会在线程的运行方法中看到这种情况:

    public void run() {
        while (true) {
            int n = 0;
            synchronized (service) { // IllegalStateException
                n = processPendingRequests();
            }

            /*
             * If n > 0, we processed at least one element, in which case we
             * immediately check the queue again until it was empty.
             */
            if (n == 0) {
                sleep();
                continue;
            }
        }
    }

service 对象会导致 IllegalStateException 吗？怎么办？

Answer 1

根据Java Language Specification ，“synchronized”语句不会抛出“IllegalStateException”。因此，据我所知，要么语言规范是错误的，要么您使用了不合格的 JVM，要么您误解了程序的行为。