private void processPojo(String counterName, Object payload) {
		BeanWrapper beanWrapper = new BeanWrapperImpl(payload);
		if (beanWrapper.isReadableProperty(fieldName)) {
			Object value = beanWrapper.getPropertyValue(fieldName);
			processValue(counterName, value);
		}
	}
Counts the occurrence of values for a set of JavaBean properties or Tuple fields using a FieldValueCounterRepository.
Assumes a String payload is JSON and will convert it to a Tuple.

@author Mark Pollack
@author David Turanski
@author Mark Fisher
spring-xd-analytics/src/main/java/org/springframework/xd/analytics/metrics/integration/FieldValueCounterHandler.java