[IGNITE-12240] ReadOnlyCollectionView2X fails on iterator.next

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.7.6
• Labels: newbie
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: kcheng.mvp
• Reporter: Nikolay Izhikov
• Created: 28/Sep/19 07:35
• Updated: 15/Dec/19 10:43

Description

Simple reproducer below will throw NoSuchElementException.
Iterator only works if one call hasNext before next.

    /** */
    @Test
    public void testReadOnlyCollection() throws Exception {
        Collection<String> c1 = Collections.emptyList();
        Collection<String> c2 = Arrays.asList("1");

        ReadOnlyCollectionView2X<String> view = new ReadOnlyCollectionView2X<>(c1, c2);

        assertEquals("1", view.iterator().next());
    }