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Date: Sat, 03 Dec 2005 14:55:31 +0000
From: Tim Ellison <t.p.ellison@gmail.com>
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To: harmony-dev@incubator.apache.org
Subject: Re: [jira] Updated: (HARMONY-19) Divide by zero exception when
 rotating
 an empty List
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George, I was just tweaking your JIRA report to reflect the new classlib
 component that Geir (I assume) created -- and it was something of an
experiment to see if JIRA allows people to modify other 'random' issues.

I've used Bugzilla before, but not JIRA so having a play, hope that's ok.

Regards,
Tim

Tim Ellison (JIRA) wrote:
>      [ http://issues.apache.org/jira/browse/HARMONY-19?page=all ]
> 
> Tim Ellison updated HARMONY-19:
> -------------------------------
> 
>     Component: Classlib
>                    (was: Contributions)
> 
> 
>>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: Classlib
>> Environment: All
>>    Reporter: George Harley
>>    Assignee: Geir Magnusson Jr
>>    Priority: Minor
>> 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);
>>		}
>>	}
> 
> 

-- 

Tim Ellison (t.p.ellison@gmail.com)
IBM Java technology centre, UK.