InterruptedException

    /**     * @see Thread#run()     */    public void run() {        log.debug("Starting thread to purge expired objects from cache every "                  + (purgeTimeMilliseconds / 1000) + " seconds");        while (true) {            log.trace("thread executing purgeExpired");            cacheService.purgeExpired();            try {                sleep(purgeTimeMilliseconds);            } catch (InterruptedException e) {                // not a problem... I don't think                log.warn("CachePurgeThread interrupted", e);                break;            }        }        run();    }