On 27/11/2017 22:40, Prasanta Sadhukhan wrote:
On 11/28/2017 3:33 AM, Sergey Bylokhov wrote:
Hi, Prasanta.
A few notes about the fix:
- Can we get an NPE in adjustScrollPositionIfNecessary at
2391 list.scrollRectToVisible(cellBounds); Not sure that
scrollRectToVisible is ready for null.
cellBounds is not null for this call due to this check in
2308 if (cellBounds != null && !visRect.contains(cellBounds)) {
In the fix you added a check at line
2384 if (cellBounds != null) {
And later you will pass the cellBounds as a parameter:
2393 list.scrollRectToVisible(cellBounds);
So either cellBounds can be null or the new check is not needed.
- I think the assignment below can be simplified
cellBounds = startRect != null ? startRect : null;
- In the getNextPageIndex() probably we can "return index"
immediately instead of additional indentation?
Done. Modified webrev
http://cr.openjdk.java.net/~psadhukhan/8191639/webrev.01/
Regards
Prasanta
On 22/11/2017 03:05, Prasanta Sadhukhan wrote:
Hi All,
Bug: https://bugs.openjdk.java.net/browse/JDK-8191639
It is seen that when JList.locationToIndex() or getCellBounds() is
overridden to return -1 or null respectively,
it causes NPE when PageUp/PageDown is pressed in JList.
From the spec
[https://docs.oracle.com/javase/9/docs/api/javax/swing/JList.html#getCellBounds-int-int-]
of getCellBounds(), it is seen that it can return null under some
circumstances. But, JList jdk code assumes it is always non-null.
Proposed fix is to check for null return value of getCellBounds() and
bail out.
webrev: http://cr.openjdk.java.net/~psadhukhan/8191639/webrev.00/
Regards
Prasanta
--
Best regards, Sergey.
