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https://issues.apache.org/jira/browse/NIFI-13988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17897747#comment-17897747
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ASF subversion and git services commented on NIFI-13988:
--------------------------------------------------------

Commit 41616773dbb1e7dc9173170ecf3e46d6c88e5ea2 in nifi's branch 
refs/heads/support/nifi-1.x from dan-s1
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=41616773db ]

NIFI-13988 Adjusted Record number conversion to treat empty String as null 
(#9513)

Signed-off-by: David Handermann <[email protected]>

> ExcelReader - Use Starting Row schema strategy and string empty values
> ----------------------------------------------------------------------
>
>                 Key: NIFI-13988
>                 URL: https://issues.apache.org/jira/browse/NIFI-13988
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.28.0, 2.0.0
>            Reporter: Philipp Korniets
>            Assignee: Daniel Stieglitz
>            Priority: Major
>             Fix For: 2.1.0
>
>         Attachments: Test workbook NiFi2_0.xlsx
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> When Use Starting Row as schema strategy in ExcelReader it analyses first 10 
> row. Problem appears with empty cells of  *Numerical* type which can appear 
> anywhere after 10 rows. The cells *looks like* NULL, but actually is an empty 
> string.
> File with example data attached. 
> Field Exercise Price. 
> Use Starting Row throws an error:
> {code:java}
> Caused by: java.lang.NumberFormatException: For input string: ""
>     at 
> java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
>     at java.base/java.lang.Long.parseLong(Long.java:719)
>     at java.base/java.lang.Long.parseLong(Long.java:832)
>     at 
> org.apache.nifi.serialization.record.util.DataTypeUtils.toLong(DataTypeUtils.java:1391)
>     at 
> org.apache.nifi.serialization.record.util.DataTypeUtils.convertType(DataTypeUtils.java:213)
>     at 
> org.apache.nifi.serialization.record.util.DataTypeUtils.convertType(DataTypeUtils.java:174)
>     at 
> org.apache.nifi.excel.ExcelRecordReader.convert(ExcelRecordReader.java:170)
>     at 
> org.apache.nifi.excel.ExcelRecordReader.lambda$getCurrentRowValues$0(ExcelRecordReader.java:127)
>     at 
> java.base/java.util.stream.Streams$RangeIntSpliterator.forEachRemaining(Streams.java:104)
>     at 
> java.base/java.util.stream.IntPipeline$Head.forEach(IntPipeline.java:617)
>     at 
> org.apache.nifi.excel.ExcelRecordReader.getCurrentRowValues(ExcelRecordReader.java:114)
>     at 
> org.apache.nifi.excel.ExcelRecordReader.nextRecord(ExcelRecordReader.java:84)
>     ... 28 common frames omitted{code}



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