[jira] [Resolved] (CSV-247) A single empty header is allowed when not allowing empty column headers.

["Gary D. Gregory (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CSV-247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gary D. Gregory resolved CSV-247.
---------------------------------
    Resolution: Fixed

I think this works as designed in git master, please see https://issues.apache.org/jira/browse/CSV-247

Note that using {{[withHeaders()|https://static.javadoc.io/org.apache.commons/commons-csv/1.7/org/apache/commons/csv/CSVFormat.html#withHeader-java.lang.String...-]}} without any arguments uses the first line as the header line.

 

> A single empty header is allowed when not allowing empty column headers.
> ------------------------------------------------------------------------
>
>                 Key: CSV-247
>                 URL: https://issues.apache.org/jira/browse/CSV-247
>             Project: Commons CSV
>          Issue Type: Bug
>    Affects Versions: 1.7
>            Reporter: Alex Herbert
>            Priority: Minor
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> If the settings are not allowing empty columns headers you can currently use a single empty header. This is because column headers are only checked for empty when they are duplicates. So it is the second empty header (the first duplicate) that raises an error. This test should pass but does not:
> {code:java}
> @Test(expected = IllegalArgumentException.class)
> public void testHeadersMissingOneColumnException() throws Exception {
>     final Reader in = new StringReader("a,,c,d\n1,2,3,4\nx,y,z,zz");    CSVFormat.DEFAULT.withHeader().parse(in).iterator(); 
> }
> {code}



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