What could this error mean:
java.lang.ClassCastException:
[Lcom.google.appengine.api.datastore.Key; cannot be cast to
com.google.appengine.api.datastore.Key
It's happening on the last line of this code:
PersistenceManager pm2 = PMF.get().getPersistenceManager();
Key k =
KeyFactory.createKey(User.class.getSimpleName(),Long.parseLong(Key));
User u = pm2.getObjectById(User.class, k);
Long[] group_array = u.getGroups();
Key[] group_keys = new Key[group_array.length];
int c = 0;
while(c < group_array.length){
group_keys[c] =
KeyFactory.createKey(Group.class.getSimpleName(),
group_array[c]);
c++;
}
javax.jdo.Query q =
pm2.newQuery(Group.class,"key.contains(:key)");
List<Group> groups = (List<Group>) q.execute(group_keys);
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