Spec for java.net.CookieStore says:

---------------------------------------------------------------
boolean removeAll()

    Remove all cookies in this cookie store.

    Returns:
        true if this store changed as a result of the call
---------------------------------------------------------------

However default implementation of this class (sun/net/www/protocol/http/InMemoryCookieStore.java) do not take if store is changed or not:


    public boolean removeAll() {
        lock.lock();
        try {
            cookieJar.clear();
            domainIndex.clear();
            uriIndex.clear();
        } finally {
            lock.unlock();
        }

        return true;
    }

So implementation is in conflict with specification
Specifically, and empty cookie store should not return true for removeAll, since there is no change as a result of the call.