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Posted to issues@commons.apache.org by "Gary Gregory (JIRA)" <ji...@apache.org> on 2018/06/12 21:46:00 UTC
[jira] [Resolved] (COLLECTIONS-673) ListUtils.partition potential
integer overflow
[ https://issues.apache.org/jira/browse/COLLECTIONS-673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gary Gregory resolved COLLECTIONS-673.
--------------------------------------
Resolution: Fixed
Fix Version/s: 4.2
Thank you for your patch, please verify and close.
> ListUtils.partition potential integer overflow
> ----------------------------------------------
>
> Key: COLLECTIONS-673
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-673
> Project: Commons Collections
> Issue Type: Bug
> Components: List
> Affects Versions: 4.1
> Reporter: John Mark
> Priority: Major
> Fix For: 4.2
>
>
> When calling {{ListUtils.partition()}} with a large size and large list, it is possible that an integer overflow will occur in the {{size()}} method that causes incorrect behavior. This will occur when using a size that, when added to list.size() will be larger than {{Integer.MAX_VALUE}}
> Current version of Guava's {{Lists.partition()}} handle this correctly, so perhaps the code for {{ListUtils.partition()}} needs to be updated based on the latest Guava code.
> A simple illustration of this:
> {code}
> List<String> aList = Arrays.asList("1", "2", "3", "4", "5");
> List<List<String>> partitioned = ListUtils.partition(aList, Integer.MAX_VALUE);
> System.out.println("Number of partitions: " + partitioned.size());
> for(List<String> l : partitioned) {
> System.out.println(l);
> }
> {code}
> The above code works correctly when using Guava's {{Lists.partition()}} instead.
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