ConcurrentModificationException with LinkedHashMap

Question

Not sure what is triggering a java.util.ConcurrentModificationException when I iterate over the LinkedHashMap structure in the code below. Using the

Answer 1

java.util.ConcurrentModificationException : If there are any structural changes (additions, removals, rehashing, etc.) to the underlying list while the iterator exists. The iterator checks to see if the list has changed before each operation. This is known as 'failsafe operation'.

If a thread modifies a collection directly while it is iterating over the collection with a fail-fast iterator, the iterator will throw this exception.Here you cannot call the get() method while using an iterator because calling get() structurally modifies the map and hence the next call to one of the iterators method fails and throws a ConcurrentModificationException.