public Iterable<?> evaluateIterable(String expression,
			Object parameterObject) {
		Object value = OgnlCache.getValue(expression, parameterObject);
		if (value == null)
			throw new RuntimeException("The expression '" + expression
					+ "' evaluated to a null value.");
		if (value instanceof Iterable)
			return (Iterable<?>) value;
		if (value.getClass().isArray()) {
			// the array may be primitive, so Arrays.asList() may throw
			// a ClassCastException (issue 209). Do the work manually
			// Curse primitives! :) (JGB)
			int size = Array.getLength(value);
			List<Object> answer = new ArrayList<Object>();
			for (int i = 0; i < size; i++) {
				Object o = Array.get(value, i);
				answer.add(o);
			}
			return answer;
		}
		if (value instanceof Map) {
			return ((Map) value).entrySet();
		}
		throw new RuntimeException("Error evaluating expression '" + expression
				+ "'.  Return value (" + value + ") was not iterable.");
	}