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IList.iterator() / listIterator() does not support iterator.remove() #5508

styjdt opened this Issue Jun 16, 2015 · 1 comment


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5 participants

styjdt commented Jun 16, 2015

Whereas IQueue.iterator() returns an iterator which explicitly throws an UnsupportedOperationException on iterator.remove(), in case of IList this operation is simply a NOOP.
One can call iterator.remove(), but it doesn't do anything.
A look in the code (ListProxyImpl) reveals, that the iterator is retrieved from a copy of the list, which explains the situation. Nevertheless here an UnsupportedOperationException would be more clear than simpy to ignore the call silently.
Of course, the "real" remove() functionality would be much better :)

My Hazelcast version: 3.4.2
Example code to reproduce:
HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();
IList list = hazelcastInstance.getList("iterate");
list.add("the entry");
Iterator iterator = list.iterator();;
System.out.println("list size should be 0, actual size:" + list.size());

Relevant result on console:
list size should be 0, actual size:1

Since iterator() calls listIterator() and that one calls listIterator(index), the issue is for all iterator-retrieving methods.

@gurbuzali gurbuzali added this to the 3.5.1 milestone Jun 17, 2015

@gurbuzali gurbuzali self-assigned this Jun 26, 2015

@enesakar enesakar modified the milestones: 3.5.1, 3.5.2 Jul 25, 2015

@degerhz degerhz modified the milestones: 3.5.3, 3.5.2 Sep 8, 2015


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jerrinot commented Oct 2, 2015

fixed by #5599

@jerrinot jerrinot closed this Oct 2, 2015

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