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https://issues.apache.org/jira/browse/AMQ-6431?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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王庆焕 updated AMQ-6431:
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Attachment: BitArrayBinTest.java
A unit test that expose the issue.
> 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
> 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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