}            }        }         private Object getAttribute(ObjectName objName, String attrName)                throws MBeanException, InstanceNotFoundException,                AttributeNotFoundException, ReflectionException, IOException {            final NameValueMap values = getCachedAttributes(                    objName, Collections.singleton(attrName));            Object value = values.get(attrName);            if (value != null || values.containsKey(attrName)) {                return value;            }            // Not in cache, presumably because it was omitted from the            // getAttributes result because of an exception.  Following            // call will probably provoke the same exception.            return conn.getAttribute(objName, attrName);        }         private AttributeList getAttributes(                ObjectName objName, String[] attrNames) throws                InstanceNotFoundException, ReflectionException, IOException {            final NameValueMap values = getCachedAttributes(                    objName,                    new TreeSet<String>(Arrays.asList(attrNames)));            final AttributeList list = new AttributeList();            for (String attrName : attrNames) {                final Object value = values.get(attrName);                if (value != null || values.containsKey(attrName)) {                    list.add(new Attribute(attrName, value));                }            }            return list;        }         private synchronized NameValueMap getCachedAttributes(                ObjectName objName, Set<String> attrNames) throws                InstanceNotFoundException, ReflectionException, IOException {            NameValueMap values = cachedValues.get(objName);            if (values != null && values.keySet().containsAll(attrNames)) {                return values;            }            attrNames = new TreeSet<String>(attrNames);            Set<String> oldNames = cachedNames.get(objName);            if (oldNames != null) {                attrNames.addAll(oldNames);            }            values = new NameValueMap();            final AttributeList attrs = conn.getAttributes(                    objName,                    attrNames.toArray(new String[attrNames.size()]));            for (Attribute attr : attrs.asList()) {                values.put(attr.getName(), attr.getValue());            }            cachedValues.put(objName, values);            cachedNames.put(objName, attrNames);            return values;        }         // See http://www.artima.com/weblogs/viewpost.jsp?thread=79394        private static <K, V> Map<K, V> newMap() {            return new HashMap<K, V>();        }    }}

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