public String[] getDomains()
{
ArrayList domains = new ArrayList(domainMap.size());
for (Iterator iterator = domainMap.entrySet().iterator(); iterator.hasNext()
{
Map.Entry entry = (Map.Entry) iterator.next();
String domainName = (String) entry.getKey();
Map mbeans = (Map) entry.getValue();
if (mbeans.isEmpty() == false)

mbeans could be null.

Similar problem in findEntries.