Nifi throwing error on startup

[#1]

Nifi throwing below error on startup:

java.util.ServiceConfigurationError: org.apache.nifi.processor.Processor: Provider org.apache.nifi.processors.standard.CalculateRecordStats could not be instantiated at java.util.ServiceLoader.fail(ServiceLoader.java:232) at java.util.ServiceLoader.access$100(ServiceLoader.java:185) at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:384) at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404) at java.util.ServiceLoader$1.next(ServiceLoader.java:480) at org.apache.nifi.nar.ExtensionManager.loadExtensions(ExtensionManager.java:148) at org.apache.nifi.nar.ExtensionManager.discoverExtensions(ExtensionManager.java:123) at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:838) at org.apache.nifi.NiFi.<init>(NiFi.java:157) at org.apache.nifi.NiFi.<init>(NiFi.java:71) at org.apache.nifi.NiFi.main(NiFi.java:296) Caused by: java.lang.NoClassDefFoundError: org/apache/nifi/serialization/RecordReaderFactory at org.apache.nifi.processors.standard.CalculateRecordStats.<clinit>(CalculateRecordStats.java:72) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:380) ... 8 common frames omitted Caused by: java.lang.ClassNotFoundException: org.apache.nifi.serialization.RecordReaderFactory at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 15 common frames omitted

Below is my pom.xml

<?xml version="1.0" encoding="UTF-8"?> <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>user-dimension-processor</groupId> <artifactId>user-dimension-artifactId</artifactId> <version>1.0</version> </parent> <artifactId>nifi-user-dimension-processors</artifactId> <packaging>jar</packaging> <dependencies> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-api</artifactId> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-utils</artifactId> <version>1.8.0</version> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-mock</artifactId> <version>1.8.0</version> <scope>test</scope> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-simple</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.bazaarvoice.jolt</groupId> <artifactId>json-utils</artifactId> <version>0.1.1</version> </dependency> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20180813</version> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-standard-processors</artifactId> <version>1.8.0</version> </dependency> <dependency> <groupId>org.apache.parquet</groupId> <artifactId>parquet-avro</artifactId> <version>1.10.0</version> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-record</artifactId> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-record-serialization-service-api</artifactId> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-dbcp-service</artifactId> <version>1.8.0</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-dbcp-service-api</artifactId> <version>1.8.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-api</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-expression-language</artifactId> <version>1.8.0</version> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-processor-utils</artifactId> <version>1.8.0</version> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-api</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-record-serialization-service-api</artifactId> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-record-serialization-services</artifactId> <version>1.2.0</version> </dependency> <dependency> <groupId>org.apache.nifi</groupId> <artifactId>nifi-ssl-context-service-api</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-io</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>com.jayway.jsonpath</groupId> <artifactId>json-path</artifactId> <version>1.2.0</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-dbcp2</artifactId> <version>2.5.0</version> </dependency> </dependencies> </project>

[#2]

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.