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Posted to dev@harmony.apache.org by "George Harley (JIRA)" <ji...@apache.org> on 2005/12/02 13:14:32 UTC
[jira] Updated: (HARMONY-19) Divide by zero exception when rotating an empty List
[ http://issues.apache.org/jira/browse/HARMONY-19?page=all ]
George Harley updated HARMONY-19:
---------------------------------
Attachment: HARMONY-19-patch-20051202.txt
Here is a patch for your perusal.
Best regards,
George
> Divide by zero exception when rotating an empty List
> ----------------------------------------------------
>
> Key: HARMONY-19
> URL: http://issues.apache.org/jira/browse/HARMONY-19
> Project: Harmony
> Type: Bug
> Components: Contributions
> Environment: All
> Reporter: George Harley
> Assignee: Geir Magnusson Jr
> Attachments: HARMONY-19-patch-20051202.txt
>
> The implementation of method rotate(List, int) in java.util.Collections is not
> checking the size of the input list prior to attempting the rotation. As a
> result, when called with an empty List argument a java.lang.ArithmeticException
> will occur because of the the subsequent divide by zero operation.
> The problem can be demonstrated in the below unit test case ...
> public void testRotateEmptyList() {
> // Create an *empty* list
> List list = new ArrayList();
> try {
> Collections.rotate(list, 25);
> } catch (Exception e) {
> fail("Unexpected exception rotating empty List : " + e);
> }
> }
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