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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-6431) BitArrayBin doesn't work well with index larger than Integer.MAX_VALUE
Date Fri, 23 Sep 2016 18:31:20 GMT

    [ https://issues.apache.org/jira/browse/AMQ-6431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15517196#comment-15517196
] 

ASF subversion and git services commented on AMQ-6431:
------------------------------------------------------

Commit 09456480b838efd97297679840d33f7949449e21 in activemq's branch refs/heads/master from
[~cshannon]
[ https://git-wip-us.apache.org/repos/asf?p=activemq.git;h=0945648 ]

https://issues.apache.org/jira/browse/AMQ-6431

Fixing BitArrayBin to not overflow in certain cases with numbers larger
than Int max


> BitArrayBin doesn't work well with index larger than Integer.MAX_VALUE
> ----------------------------------------------------------------------
>
>                 Key: AMQ-6431
>                 URL: https://issues.apache.org/jira/browse/AMQ-6431
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: JMS client
>    Affects Versions: 5.14.0
>            Reporter: 王庆焕
>            Assignee: Christopher L. Shannon
>         Attachments: BitArrayBinTest.java
>
>
> I have a problem with "messageid deplicate". Then I found it's a bug(AMQ-5016) in activemq5.9.0
, so I download the activemq5.14.0. I run the BitArrayBinTest.java:
> {code}
>  public static void main(String[] args) {
>        BitArrayBin toTest = new BitArrayBin(1024);
>        long largeNum = Integer.MAX_VALUE*2L +100L;
>        toTest.setBit(largeNum, true);
>        System.out.println(toTest.getBit(largeNum));   
> }
> {code}
>  I expect the results to be "true",but the result of running the above code is "false".

> I debug the code,and I  found a method 'getBin(long index)' in class BitArrayBin. Code
as follows:
> {code}
> private int getBin(long index) {
>         int answer = 0;
>         if (longFirstIndex < 0) {
>             longFirstIndex = (int) (index - (index % BitArray.LONG_SIZE));
>         } else if (longFirstIndex >= 0) {
>             answer = (int)((index - longFirstIndex) / BitArray.LONG_SIZE);
>         }
>         return answer;
>     }
> {code}
>  I think the problem is in  code ‘longFirstIndex = (int) (index - (index % BitArray.LONG_SIZE))‘.
 When  index is larger than Integer.MAX_VALUE, longFirstIndex will be negative.  I think this
line of code should be modified to  ‘longFirstIndex = (long) (index - (index % BitArray.LONG_SIZE));’
>    
>     



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