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From Mike Thomsen <>
Subject Re: ClassNotFound exception for JSON provider within NiFi custom processor
Date Tue, 21 May 2019 14:22:28 GMT
> in the gradle build file

Are you manually making Gradle do all of the packaging work that the Maven
NAR plugin does? If not, that's probably a lot of the problem right there.

On Tue, May 21, 2019 at 10:19 AM Tim Dean <> wrote:

> Hello,
> I have a custom NiFi processor and controller service that makes use of
> the JSON streaming API, as defined by JSR-374. This API is defined by an
> API jar file and requires a separate jar file with an implementation of the
> API. I have chosen to use the Glassfish reference implementation.  As a
> result, I have the following dependencies in the gradle build file for both
> my controller service and my processor nar files:
> > compile group: ‘javax.json’, name: ‘javax.json-api’, version: ‘1.1.4’
> > compile group: ‘org.glassfish’, name: ‘javax.json’, version: ‘1.1.4’
> My processor’s nar file is a child of the controller service API’s nar
> file, as is the nar file for the controller service’s implementation.
> When my processor runs, it gets its controller service reference and then
> calls a method on that controller service. That method’s implementation
> tries to instantiate a JSON parser, but gets a ClassNotFoundException. It
> cannot find the class “org.glassfish.json.JsonProviderImpl” - a class that
> I have confirmed exists in the javax.json-1.1.4.jar file.
> I have looked in the
> /opt/nifi-1.8/work/nar/extensions/<my-nar-file>-unpacked/NAR-INF/bundled-dependencies/
> directories for both the controller service implementation and for the
> processor nar files. Both appear to be receiving the javax.json and the
> javax.json-api jar files.
> Running both the controller service implementation and the processor works
> fine in my unit tests.
> I suspect that there must be something I’m missing with nar file class
> loaders at play here, but I have been unable to figure out how to fix this
> problem.
> I’d appreciate any feedback on what I might be doing wrong here.
> Thanks
> -Tim

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