BackendListener.setQueueSize(int queueSize) currently uses an int for the queue size.
Although the value needs to be used as an integer, I think it should be stored as a String, otherwise it cannot be replaced with a variable reference. That seems an unnecessary restriction. We should be very wary of using anything other than String for values that are stored in JMX files. There are some exceptions, for example ConstantThroughputTimer uses an int for the CalcMode. S.
