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https://issues.apache.org/jira/browse/UIMA-5346?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marshall Schor resolved UIMA-5346.
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Resolution: Fixed
> sort compare method not following contract, sometimes get IllegalArgExcptn
> --------------------------------------------------------------------------
>
> Key: UIMA-5346
> URL: https://issues.apache.org/jira/browse/UIMA-5346
> Project: UIMA
> Issue Type: Bug
> Components: Core Java Framework
> Reporter: Marshall Schor
> Assignee: Marshall Schor
> Fix For: 3.0.0SDK-alpha02
>
>
> BinaryCasSerDes6 has a method used for sort comparison. At one point in
> testing, a test case threw an IllegalArgumentException from TimSort, one of
> the implementations of sort in Java, where it determined some invalid state
> due to the sortCompare not obeying the contract.
> This could be due to equals(fs1, fs2) == false and sortCompare(fs1, fs2) == 0.
> Fix this in two places: Add equals method for FeatureStructureImplC that
> returns 0 if the _id fields are the same. This matches the hashcode for that.
> Change the sortCompare function to only return 0 if the id's are the same.
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