[COLLECTIONS-734] Encountered an IllegalStateException while traversing with Flat3Map.entrySet()

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0
• Fix Version/s: 4.5.0-M1
• Component/s: Map
• Assignee: Unassigned
• Reporter: Chen
• Created: 11/Nov/19 08:07
• Updated: 05/Dec/19 16:13
• Resolved: 05/Dec/19 16:13

Description

Encountered an IllegalStateException while traversing with Flat3Map.entrySet()

//代码示例
    public void testEntrySet() {
        final Flat3Map<Integer, String> map = new Flat3Map<>();
        map.put(1, "A");
        map.put(2, "B");
        map.put(3, "C");
        Iterator<Map.Entry<Integer, String>> it = map.entrySet().iterator();        Map.Entry<Integer, String> mapEntry1 = it.next();
        Map.Entry<Integer, String> mapEntry2 = it.next();
        Map.Entry<Integer, String> mapEntry3 = it.next();
        it.remove();        assertEquals(2, map.size());
    }

Using the above code will generate an IllegalStateException.
The reason for this problem is that there is a problem with the EntryIterator.remove() method in the Flat3Map java class.

I submitted a PR(https://github.com/apache/commons-collections/pull/115) to fix this bug.

Issue Links

• links to: GitHub Pull Request #115