nifi: NoClassDefFoundError - AbstractListProcessor -


i'm extending standard processor create custom nifi processor. project builds fine. but, when restart nifi after adding newly generated nar lib/ directory, nifi fails start noclassdeffounderror:

java.lang.noclassdeffounderror: org/apache/nifi/processor/util/list/abstractlistprocessor     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclass(classloader.java:763)     @ java.security.secureclassloader.defineclass(secureclassloader.java:142)     @ java.net.urlclassloader.defineclass(urlclassloader.java:467)     @ java.net.urlclassloader.access$100(urlclassloader.java:73)     @ java.net.urlclassloader$1.run(urlclassloader.java:368)     @ java.net.urlclassloader$1.run(urlclassloader.java:362)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:361)     @ java.lang.classloader.loadclass(classloader.java:424)     @ java.lang.classloader.loadclass(classloader.java:357)     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclass(classloader.java:763)     @ java.security.secureclassloader.defineclass(secureclassloader.java:142)     @ java.net.urlclassloader.defineclass(urlclassloader.java:467)     @ java.net.urlclassloader.access$100(urlclassloader.java:73)     @ java.net.urlclassloader$1.run(urlclassloader.java:368)     @ java.net.urlclassloader$1.run(urlclassloader.java:362)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:361)     @ java.lang.classloader.loadclass(classloader.java:424)     @ java.lang.classloader.loadclass(classloader.java:357)     @ java.lang.class.forname0(native method)     @ java.lang.class.forname(class.java:348)     @ java.util.serviceloader$lazyiterator.nextservice(serviceloader.java:370)     @ java.util.serviceloader$lazyiterator.next(serviceloader.java:404)     @ java.util.serviceloader$1.next(serviceloader.java:480)     @ org.apache.nifi.nar.extensionmanager.loadextensions(extensionmanager.java:138)     @ org.apache.nifi.nar.extensionmanager.discoverextensions(extensionmanager.java:113)     @ org.apache.nifi.web.server.jettyserver.start(jettyserver.java:699)     @ org.apache.nifi.nifi.<init>(nifi.java:160)     @ org.apache.nifi.nifi.main(nifi.java:267)

can me understand if i'm missing here.

i'm using following dependencies in processor-bundle's pom.xml:

<dependency>     <groupid>org.apache.nifi</groupid>     <artifactid>nifi-api</artifactid>     <version>1.3.0</version> </dependency> <dependency>     <groupid>org.apache.nifi</groupid>     <artifactid>nifi-standard-processors</artifactid>     <version>1.3.0</version>     <scope>provided</scope> </dependency> <dependency>     <groupid>org.apache.nifi</groupid>     <artifactid>nifi-processor-utils</artifactid>     <version>1.3.0</version> </dependency> <dependency>     <groupid>org.apache.nifi</groupid>     <artifactid>nifi-utils</artifactid>     <version>1.3.0</version> </dependency>

my imports in code:

import org.apache.commons.io.ioutils; import org.apache.nifi.components.propertydescriptor; import org.apache.nifi.flowfile.attributes.coreattributes; import org.apache.nifi.processor.processcontext; import org.apache.nifi.processor.util.standardvalidators; import org.apache.nifi.processor.util.list.abstractlistprocessor; import org.apache.nifi.processors.standard.util.fileinfo; import org.apache.nifi.processors.standard.util.filetransfer; import org.apache.nifi.processors.standard.listfile;

generally processors aren't meant extended , better not have dependency on nifi-standard-nar. nifi-processor-utils project exists hold common code share across processors abstractlistprocessor:

https://github.com/apache/nifi/tree/master/nifi-nar-bundles/nifi-extension-utils

if there other code in nifi-standard-processors should shared should @ refactoring , moving modules under nifi-extension-utils.

for now, better off copying , pasting listfile, filetransfer, , fileinfo own project , modifying them accordingly, , remove dependency on nifi-standard-processors.

to answer specific question why exception... because nar needs have nar dependency on nifi-standard-nar in order resolve classes @ runtime. wiki page shows example same situation:

https://cwiki.apache.org/confluence/display/nifi/maven+projects+for+extensions#mavenprojectsforextensions-linkingprocessorsandcontrollerservices


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