try
{
InputStream stream = new FileInputStream(index);
ObjectInputStream ois = new ObjectInputStream(stream);
Map map = (Map)ois.readObject();
sessionIdToEntryMap = new ConcurrentHashMap(map);
for (Iterator entries = sessionIdToEntryMap.entrySet().iterator(); entries.hasNext();)
{
// initialize the diskPageStore reference
Entry entry = (Entry)entries.next();
SessionEntry sessionEntry = (SessionEntry)entry.getValue();