After some messing around, I think I found an answer to this question. I had the same problem, using Nifi 1.9.2. When I add a nar-file with my own processor to the extensions directory: 2019-08-14 09:29:55,591 INFO [NAR Auto-Loader] org.apache.nifi.nar.NarAutoLoaderTask Found .\extensions\nifi-neskio-nar-1.0-SNAPSHOT.nar in auto-load directory
2019-08-14 09:30:00,593 INFO [NAR Auto-Loader] org.apache.nifi.nar.StandardNarLoader Starting load process for 1 NARs...
2019-08-14 09:30:01,456 INFO [NAR Auto-Loader] org.apache.nifi.nar.StandardNarLoader Creating class loaders for 1 NARs...
2019-08-14 09:30:01,473 INFO [NAR Auto-Loader] org.apache.nifi.nar.NarClassLoaders Loaded NAR file: C:\S\nifi-1.9.2\.\work\nar\extensions\nifi-neskio-nar-1.0-SNAPSHOT.nar-unpacked as class loader org.apache.nifi.nar.NarClassLoader[.\work\nar\extensions\nifi-neskio-nar-1.0-SNAPSHOT.nar-unpacked]
2019-08-14 09:30:01,475 INFO [NAR Auto-Loader] org.apache.nifi.nar.StandardNarLoader Successfully created class loaders for 1 NARs, 0 were skipped
2019-08-14 09:30:01,943 ERROR [NAR Auto-Loader] org.apache.nifi.NiFi An Unknown Error Occurred in Thread Thread[NAR Auto-Loader,5,main]: java.util.ServiceConfigurationError: org.apache.nifi.processor.Processor: Provider org.apache.nifi.processors.standard.CalculateRecordStats could not be instantiated
2019-08-14 09:30:01,946 ERROR [NAR Auto-Loader] org.apache.nifi.NiFi java.util.ServiceConfigurationError: org.apache.nifi.processor.Processor: Provider org.apache.nifi.processors.standard.CalculateRecordStats could not be instantiated etcetera... (The HTML editor keeps forgetting newlines, so the above may look garbled.) I tried to add a dependency in my pom-file, hoping that org/apache/nifi/serialization/RecordReaderFactory could then be found: <dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-record-serialization-service-api</artifactId>
</dependency> This still gives the same exception. Then I read this blog post, which advises to omit the dependency on nifi-standard-processors. That works, but now I cannot use annotations like @SeeAlso({PutFile.class, GetFile.class, FetchFile.class}) I am still finding out what to do if I do want to have nifi-standard-processors.
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