异常捕获何时用Exception，何时用Throwable

用Exception的情况
try {
       //可能发生空指针、数组溢出等异常
        } catch (Exception e) {
            throw new CashierIntegrationException();
        }

用Throwable的情况
try {
        //可能发生空指针、数组溢出、NoClassDefFoundError等异常
        } catch (Throwable e) {
            throw new CashierIntegrationException();
        }