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Jan
30
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The general cause of a ConcurrentModificationException is from trying to remove an instance from a collection that is being iterated over as in the following example.
Iterator i = mylist.iterator();
while (i.hasNext())
{
Object o = i.next();
if (something)
{
// following line will throw ConcurrentModificationException
mylist.remove(o);
}
}
The correct way is to instead use the Iterator’s remove() method as shown in the following snippet:
Iterator i = mylist.iterator();
while (i.hasNext())
{
Object o = i.next();
if (something)
{
i.remove();
}
}
6 Responses to “How to fix ConcurrentModificationException?”
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May 27th, 2011 at 4:16 am
Thank you very much! This solved a problem I had that was driving me crazy.
June 21st, 2011 at 6:54 pm
Thank you, you just save my day !!!
August 6th, 2011 at 5:03 am
Like the others, thanks, you’ve saved me a headache!
August 30th, 2011 at 3:01 am
Thanks for the explanation!!!
In my case I decided to do clone(), so to avoid this, because my program runs in two threads.
January 13th, 2012 at 5:12 pm
Thanks a lot…
February 27th, 2012 at 8:07 pm
Thx, worked like a charm 🙂