[NIFI-5567] EvaluateXPath processor produces empty string sets for valid XPaths

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.7.1
• Component/s: Extensions
• Labels: XPath xml
• Flags: Important
• Assignee: Unassigned
• Reporter: Christof Dilcher
• Created: 03/Sep/18 04:35
• Updated: 04/Sep/18 08:44

Description

I have found that valid XPath expressions apparently produce empty strings in EvaluateXPath processor which can be observed in the attached screenshots. I am using nifi 1.7.1 and jdk1.8.0_181.jdk. Any help would be appreciated!

The source of the XML files is a GetFile Processor or a GenrateFlowFile Processor.

I have also tested it with an InvokeHTTP processor where it works fine. However this does not solve it for me as I am dealing with physical XML files here. However this little detail might be interesting for the error finding process.