concurrentmodification - Read For Learn

java.util.ConcurrentModificationException with iterator

You must use iterator.remove() instead of tableRecords.remove() You can remove items on a list on which you iterate only if you use the remove method from the iterator. EDIT : When you create an iterator, it starts to count the modifications that were applied on the collection. If the iterator detects that some modifications were made without using … Read more

Why is a ConcurrentModificationException thrown and how to debug it

This is not a synchronization problem. This will occur if the underlying collection that is being iterated over is modified by anything other than the Iterator itself. This will throw a ConcurrentModificationException when the it.hasNext() is called the second time. The correct approach would be Assuming this iterator supports the remove() operation.