I have a directory /home/user/nifi-nars, which is listed in the nifi.properties file located under the nifi-assembly directory from the nifi-master code. That's where I redropped my NAR file at.
The error was "due to uncaught Exception: java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils". I added a provided dependency of version 3.4 for commons-lang3 in my processors pom.xml. That worked initially, but with the redropping of the NAR file, the error occurs. The stacktrace points to the session.get() lambda function trying to use StringUtils.isBlank(). (Again, this is a copy and renamed class of the Wait Processor. Trying to turn it into a Yield, as it were, hold unless it's free to move forward.) -------------------------------------------- On Tue, 10/16/18, Bryan Bende <bbe...@gmail.com> wrote: Subject: Re: Compiling custom processor To: dev@nifi.apache.org Date: Tuesday, October 16, 2018, 3:34 PM There shouldn't be any issue doing that, generally you just copy the new NAR into the lib directory and restart. What were the specifics of the class not found error? On Tue, Oct 16, 2018 at 3:24 PM John McGinn <figgie...@sbcglobal.net> wrote: > > And I'm back. > > So, I had my processor running, no errors, so things were good. > > I then add 2 if statements with logger messages, run the same mvn command, copied the new NAR on top of the old one, same versionId and all, and now I get a class not found error, that didn't occur before I stopped, redeployed and started. And I can't delete the event in the queue even though source and destination are stopped. > > Is there problems when redeploying a custom processor NAR on top of itself? Even if the NiFi instance is stopped? Serialization issues? > > Frustratedly yours, > John McGinn > > -------------------------------------------- > On Tue, 10/16/18, John McGinn <figgie...@sbcglobal.net> wrote: > > Subject: Re: Compiling custom processor > To: dev@nifi.apache.org > Date: Tuesday, October 16, 2018, 1:21 PM > > Thanks Bryan, > > I restarted with a fresh maven > generate, and only added the API to the processor pom, and > then the API-NAR to the NAR pom. I then figured out a > subsequent dependency (lang3), and got that in, and now my > processor shows up in local NiFi instance. > > Regarding the copying of the standard > processor, when I copied Wait over, I renamed it from Wait > to MyProcessorWait to be unique, and not copied. I'm just > attempting changes to Wait without modifying the actual one. > Also, thanks on the META-INF/services file information. > > Now I can debug and test. > > Sincerely, > John McGinn > > -------------------------------------------- > On Tue, 10/16/18, Bryan Bende <bbe...@gmail.com> > wrote: > > Subject: Re: Compiling custom > processor > To: dev@nifi.apache.org > Date: Tuesday, October 16, 2018, 9:52 > AM > > In general, if your processor > uses a controller service then the > processors pom file needs a provided > dependency > on the API of the CS, > and your NAR pom needs > a NAR dependency on the NAR where the > CS API > is. > > Example is > shown here in the section linking > processors and > controller > services - >https://cwiki.apache.org/confluence/display/NIFI/Maven+Projects+for+Extensions > > Also, you do not want to > include NiFI's standard processors in > your > own NAR, this will result in two > copies of > every standard processor. > You will want to > copy whatever code you need into your > own NAR. > > In you last statement, if you > made a new processor in > nifi-standard-processors and it didn't > show > up, it is most likely > because you didn't > update META-INF/services file to > include the new > processor. > On Tue, Oct 16, 2018 at > 9:36 AM John McGinn > <amruginn-n...@yahoo.com.invalid> > wrote: > > > > Ok, I am > far from a maven expert, and am > struggling on this > problem. > > > > I created > a new project using the maven generate > process, and compiled > that sample processor and everything > was fine, and I could > see it in my local NiFi instance. I > then copied over the > Wait processor on top of the > MyProcessor.java class, changed > the package name, and the class name, > and attempted to > compile. Got errors due to dependency > issues. This is where > I get confused. > > > > In > the processor directory, I modify the > pom.xml with a > dependency line for nifi-api, > nifi-utils, > > nifi-distribute-cache-client-service-api and > nifi-standard-processors. This seemed > to make things work, > and I get a 33 meg NAR file, which > contains lots of JARs. I > load that up, and I get a problem with > CalculateStats, or > similar, because of > RecordReaderFactory. I go back in and > include > nifi-record-serialization-services, and it compiles, > and the JAR is included in the NAR > file now, and I still get > class not found. > > > > > I've also tried to change the > dependencies to a status > of provided, and therefore get a > minimal 25k or so NAR file > with no JARs included. I get the same > issue with the class > not found. > > > > I had > also attempted to copy Wait.java to > AnotherWait.java within > the actually NiFi source code, and it > compiles, and shows up > in the JARs and NARs as I'd expect, > but I cannot get to > it within my NiFi instance. > > > > Can someone let me know what I'm > doing > wrong. > > > > Thanks, > > John McGinn >
