simplified Jcache test 

simplified the Entry processor Test and added description comments
this means the delayMs can be greater then maxProcessorDelayMs. It's counter-intuitive. It's better to do it this way:
delayMs = random.nextInt((maxProcessorDelayMs - minProcessorDelayMs) + 1) + minProcessorDelayMs;

besides that I would recommend to move it to own method (getRandomSleepMs() ?) as it will make the main flow (your test scenario) easier to read.