Problem going over a Set in java 5.0

Question

Hi Guys!
I'm "translating" working code in NIO to the tiger version, and i'm having trouble with going over a Set returned from select().
Runing the following code fails on iter.remove() and i get a java.lang.UnsupportedOperationException. Couldn't find an example that work.
for (Iterator<SelectionKey> iter = connectionSelector.keys().iterator(); iter.hasNext();)
            SelectionKey key = iter.next();
            iter.remove();
            if (key.isAcceptable())
                handleAccept(key);
            else if (key.isReadable())
                handleRead(key);
}  Thanks for any help,
snayit

Answer 1

You will probably find that the collection is an unmodifiable version. From the 5.0 API
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collections.html
Collections.unmodifiableCollection(Collection<? extends T> c)
Returns an unmodifiable view of the specified collection. This method allows modules to provide users with "read-only" access to internal collections. Query operations on the returned collection "read through" to the specified collection, and attempts to modify the returned collection, whether direct or via its iterator, result in an UnsupportedOperationException
Check the Set and Iterator implementing classes using:
System.out.println(mySet.getClass().getName());
System.out.println(mySet.iterator().getClass().getName());Cheers, Neil