Hello:
I am using memcache to keep track of logged users in an app that I am
building. However when I do a GET on the memcache I get an exception:
exception: java.lang.ClassCastException: java.util.ArrayList cannot be
cast to java.util.HashMap
>From the logs it appears that the exception is caused by the
statement:
HashMap<String, UserDetails> userMap = (HashMap<String,
UserDetails>) _cache
.get(user.getInstance());
in the method logOn.
Any ideas as to what the issue could be ?
---------------------------------
Code snippet below:
import com.samuuhanet.main.shared.UserDetails;
public class LoggedUsers {
private static LoggedUsers _cacheInstance;
private static boolean _invalidationDone = false;
private Cache _cache;
public static final Logger _log = Logger.getLogger(LoggedUsers.class
.getName());
private LoggedUsers() {
try {
CacheFactory cacheFactory = CacheManager.getInstance()
.getCacheFactory();
_cache =
cacheFactory.createCache(Collections.emptyMap());
} catch (CacheException e) {
// Log stuff
_log.log(Level.WARNING, "Error in creating the Cache");
}
}
public static synchronized LoggedUsers getInstance() {
if (_cacheInstance == null) {
_cacheInstance = new LoggedUsers();
}
return _cacheInstance;
}
public void logOn(UserDetails user) {
if (_cache == null)
return;
HashMap<String, UserDetails> userMap = (HashMap<String,
UserDetails>) _cache
.get(user.getInstance());
// Check if user already exists
if (userMap == null) {
userMap = new HashMap<String, UserDetails>();
}
userMap.put(user.getUserName(), user);
_cache.put(user.getInstanceID(), userMap);
}
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