Github user jvwing commented on the issue:
https://github.com/apache/nifi/pull/929
I have a few more comments from running the processor and reviewing the
code:
**Processor Annotations**
* The CapabilityDescription says this processor transfers one flowfile for
each sheet in the Excel document, but that was not my experience. It
aggregated all content into one output flowfile. Is that the intended behavior?
* Most NiFi attribute names are lowercase, "sheetname" or "sheet.name"
instead of "SheetName". I don't believe there is a hard and fast rule there,
but I recommend going lowercase if you do not have a strong preference.
**Properties**
* PropertyDescriptors should have `name` as a machine readable key like
"extract-sheets" and `displayName` for the user "Sheets to Extract".
**Exception Handling and Logging**
Most NiFi components use `getLogger().error(...` as you do later in the
code, rather than `printStackTrace()`. I haven't tested these error cases, but
they appear to be informational rather than stopping or failing the flow.
Would `getLogger().info(...` or `getLogger().debug(...` be a better fit here?
Do users need the full stack trace, or would just the message be helpful enough?
```
} catch (InvalidFormatException e) {
e.printStackTrace();
} catch (OpenXML4JException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
```
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