Answer by Jonathan for Circuit breaker design pattern implementation

For a simple, straightforward circuit breaker implementation, check out Failsafe (which I authored). Ex:

CircuitBreaker breaker = new CircuitBreaker()  .withFailureThreshold(5)  .withSuccessThreshold(3)  .withDelay(1, TimeUnit.MINUTES);Failsafe.with(breaker).run(() -> connect());

Doesn't get much simpler.