[NIFI-9882] NullPointerException on startup from HtmlDocumentationWriter results in component documentation not being available

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 1.17.0, 1.16.1
• Component/s: Core Framework
• Assignee: David Handermann
• Reporter: Mark Payne
• Created: 06/Apr/22 15:48
• Updated: 07/Apr/22 17:31
• Resolved: 06/Apr/22 18:38

Description

On startup, we see this in the nifi-app.log:

2022-04-06 11:32:42,656 WARN [main] o.apache.nifi.documentation.DocGenerator Unable to document: class org.apache.nifi.processors.mongodb.gridfs.PutGridFS
java.lang.NullPointerException: null
    at com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:458)
    at org.apache.nifi.documentation.html.HtmlDocumentationWriter.writeSimpleElement(HtmlDocumentationWriter.java:852)
    at org.apache.nifi.documentation.html.HtmlDocumentationWriter.writeProperties(HtmlDocumentationWriter.java:518)
    at org.apache.nifi.documentation.html.HtmlDocumentationWriter.writeBody(HtmlDocumentationWriter.java:160)
    at org.apache.nifi.documentation.html.HtmlDocumentationWriter.write(HtmlDocumentationWriter.java:92)
    at org.apache.nifi.documentation.DocGenerator.document(DocGenerator.java:142)
    at org.apache.nifi.documentation.DocGenerator.documentConfigurableComponent(DocGenerator.java:104)
    at org.apache.nifi.documentation.DocGenerator.generate(DocGenerator.java:65)
    at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:1028)
    at org.apache.nifi.NiFi.<init>(NiFi.java:170)
    at org.apache.nifi.NiFi.<init>(NiFi.java:82)
    at org.apache.nifi.NiFi.main(NiFi.java:330)
2022-04-06 11:32:42,657 WARN [main] o.apache.nifi.documentation.DocGenerator Unable to document: class org.apache.nifi.processors.standard.SegmentContent
java.lang.NullPointerException: null
    at com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:458)
    at org.apache.nifi.documentation.html.HtmlDocumentationWriter.writeSimpleElement(HtmlDocumentationWriter.java:852)
    at org.apache.nifi.documentation.html.HtmlDocumentationWriter.writeProperties(HtmlDocumentationWriter.java:518)
    at org.apache.nifi.documentation.html.HtmlDocumentationWriter.writeBody(HtmlDocumentationWriter.java:160)
    at org.apache.nifi.documentation.html.HtmlDocumentationWriter.write(HtmlDocumentationWriter.java:92)
    at org.apache.nifi.documentation.DocGenerator.document(DocGenerator.java:142)
    at org.apache.nifi.documentation.DocGenerator.documentConfigurableComponent(DocGenerator.java:104)
    at org.apache.nifi.documentation.DocGenerator.generate(DocGenerator.java:65)
    at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:1028)
    at org.apache.nifi.NiFi.<init>(NiFi.java:170)
    at org.apache.nifi.NiFi.<init>(NiFi.java:82)
    at org.apache.nifi.NiFi.main(NiFi.java:330) 

For pretty much every component. As a result, the documentation is unavailable when clicking "View Usage"

Issue Links

• is caused by: NIFI-9872 Upgrade Azure SDK to 1.2.0 for Sensitive Properties
• is related to: NIFI-9883 Refactor Property Protection Modules for Isolated Loading
• links to: GitHub Pull Request #5935