[NIFI-8400] SystemDiagnostics throws NPE on Windows

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.14.0
• Component/s: Core Framework
• Assignee: Matt Burgess
• Reporter: Matt Burgess
• Created: 07/Apr/21 15:56
• Updated: 28/Apr/21 15:56
• Resolved: 08/Apr/21 08:09

Description

SystemDiagnostics includes some Long member variables such as openFileHandles that are not populated on Windows, so they remain null and when getOpenFileHandles() is called, the null is cast to a long which throws an NPE.

The member variables should be long not Long, thereby getting a default value of zero and avoiding an NPE when the values are not populated. If Long is used elsewhere, a null check should be added to avoid possible NPEs when calling the setter methods.

Issue Links

• fixes: MINIFI-550 Failed to capture component stats for Stats History
• fixes: NIFI-8401 o.apache.nifi.controller.FlowController Failed to capture component stats for Stats History on Windows Systems
• links to: GitHub Pull Request #4980