How to check if a thread is sleeping?

Question

Is there any way to check if a given thread is sleeping?

Answer 1

Here is an fairly ugly hack to check if the other thread is sleeping:

public static boolean isSleeping(Thread t) {
    StackTraceElement[] ste = t.getStackTrace();

    if (ste.length == 0)
        return false;     // thread has terminated!

    return ste[0].getClassName().equals("java.lang.Thread")
        && ste[0].getMethodName().equals("sleep");
}