public long getBackOffMaxInterval(long defaultValue) {
		return getProperty(BACK_OFF_MAX_INTERVAL, defaultValue);
	}
Return the 'backOffMaxInterval' property or the default value.
This is used in the retry template's ExponentialBackOffPolicy
in buses that support retry.
@param defaultValue The default value.
@return The property or default value.
spring-xd-messagebus-spi/src/main/java/org/springframework/xd/dirt/integration/bus/AbstractBusPropertiesAccessor.java