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https://issues.apache.org/jira/browse/CSV-82?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238440#comment-13238440
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Emmanuel Bourg commented on CSV-82:
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The header line should indeed identify all the columns of the file, but the
parsing code might be ready to handle more columns than actually present.
I have a case where a file contains a date and a time column. The file is
generated by a servlet, and depending on a query parameter the time column
might be omitted. There is a unique parsing code for both cases, this code
considers the time information as optional. It fetches the time column by name
and simply ignores a null value.
> CSVRecord inconsistent behaviour when header mapping is not found
> -----------------------------------------------------------------
>
> Key: CSV-82
> URL: https://issues.apache.org/jira/browse/CSV-82
> Project: Commons CSV
> Issue Type: Bug
> Reporter: Sebb
>
> The CSVRecord#get(String) method has inconsistent behaviour.
> If no header mapping was provided, then it throws IllegalStateException.
> If the header name is not found, null is returned.
> Apart from being inconsistent, it might be useful in the future to be able to
> return null as a column value (as distinct from the empty string).
> It should throw IllegalArgumentException for a missing header name, instead
> of returning null.
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