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https://issues.apache.org/jira/browse/NIFI-10599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kevin Doran resolved NIFI-10599.
--------------------------------
Resolution: Fixed
> NAR plugin duplicates class loader dependencies during doc generation
> ---------------------------------------------------------------------
>
> Key: NIFI-10599
> URL: https://issues.apache.org/jira/browse/NIFI-10599
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: nifi-nar-maven-plugin-1.3.4
> Reporter: Bryan Bende
> Assignee: Bryan Bende
> Priority: Minor
> Fix For: nifi-nar-maven-plugin-1.4.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> When creating the parent class loader hierarchy, the top most NAR ends up
> being in the chain twice, and one of the times it has a null NarArtifact.
> This doesn't impact generating the manifest for any of the NARs provided by
> NiFi because all of them have the Jetty NAR as a parent which doesn't
> actually provided any extensions, so the Jetty libs are just there twice.
> It does however affect a standalone bundle where a controller service API NAR
> doesn't have a parent NAR. In this case the API interface can be loaded from
> the class loader which has a null NAR artifact and gets an NPE trying to
> produce the manifest.
> {code:java}
> Caused by: java.lang.NullPointerException
> at
> org.apache.nifi.extension.definition.extraction.ExtensionDefinitionFactory.processImplementedInterface
> (ExtensionDefinitionFactory.java:132)
> at
> org.apache.nifi.extension.definition.extraction.ExtensionDefinitionFactory.addProvidedServiceAPIs
> (ExtensionDefinitionFactory.java:102)
> at
> org.apache.nifi.extension.definition.extraction.ExtensionDefinitionFactory.getProvidedServiceAPIs
> (ExtensionDefinitionFactory.java:86)
> at
> org.apache.nifi.extension.definition.extraction.ExtensionDefinitionFactory.createExtensionDefinition
> (ExtensionDefinitionFactory.java:75)
> at
> org.apache.nifi.extension.definition.extraction.ExtensionDefinitionFactory.discoverExtensions
> (ExtensionDefinitionFactory.java:64)
> at org.apache.nifi.NarMojo.generateDocumentation (NarMojo.java:621)
> at org.apache.nifi.NarMojo.execute (NarMojo.java:511) {code}
> An example to reproduce the issue is here:
> [https://github.com/bbende/nifi-dependency-example]
>
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