Re: ConcurrentModificationException in single-threaded context

laurens.vanhels@telenet.be wrote:


     Meaning no insult, I suspect the latter.

     You say you "never extract iterators," but I bet you do without
realizing it. Note that the `for (Thing t : things)' loop is really
just shorthand for

    for (Iterator<Thing> it = things.iterator(); it.hasNext(); ) {
        Thing t = it.next();
        ...
    }

so you may be using Iterators even if the string "Iterator" never
shows up in your source code.

     From your description, I suspect `things' is either the keySet()
or entrySet() of the Map. If the "..." code executes put() on the
Map (or modifies the Map in any other way), the Iterator will throw[*]
ConcurrentModificationException at the next hasNext() call.

     [*] "Will very probably throw," really. See the Javadoc.

--
Eric.Sosman@sun.com