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https://issues.apache.org/jira/browse/CSV-302?focusedWorklogId=819115&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-819115
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ASF GitHub Bot logged work on CSV-302:
--------------------------------------
Author: ASF GitHub Bot
Created on: 21/Oct/22 12:20
Start Date: 21/Oct/22 12:20
Worklog Time Spent: 10m
Work Description: garydgregory commented on PR #276:
URL: https://github.com/apache/commons-csv/pull/276#issuecomment-1286887439
Please see the discussion on the developer's mailing list
https://lists.apache.org/thread/p017hp6qq1zcphg7pr1ko4swvvw8ynch
Mailing list info: https://commons.apache.org/mail-lists.html
Issue Time Tracking
-------------------
Worklog Id: (was: 819115)
Time Spent: 2h 20m (was: 2h 10m)
> CSVFormat.duplicateHeaderMode requires default for backward compatibility
> -------------------------------------------------------------------------
>
> Key: CSV-302
> URL: https://issues.apache.org/jira/browse/CSV-302
> Project: Commons CSV
> Issue Type: Bug
> Components: Parser
> Affects Versions: 1.x
> Reporter: Markus Spann
> Priority: Minor
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> The member in class {{CSVFormat}}
> {code:java}
> boolean allowDuplicateHeaderNames{code}
> was recently replaced by
> {code:java}
> DuplicateHeaderMode duplicateHeaderMode{code}
> The boolean defaults to {{{}false{}}}, while the member of type
> {{DuplicateHeaderMode}} defaults to {{{}null{}}}.
> {{duplicateHeaderMode}} must be initialized with {{DISALLOW}} for backward
> compatibility.
> The change is also problematic with regards to serialization. The class is
> serializable and {{serialVersionUID}} is unchanged between versions. The
> boolean setting {{allowDuplicateHeaderNames}} in an object serialized in
> version 1.9.0 or earlier would always be de-serialized to
> {{duplicateHeaderMode = null}} in the current head.
> To handle the code changes correctly, customized de-serialization would need
> to be implemented.
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