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From "Joe Witt (Jira)" <>
Subject [jira] [Commented] (NIFI-7781) Nar loading should not impact the loading of NiFi overall
Date Tue, 01 Sep 2020 14:59:00 GMT


Joe Witt commented on NIFI-7781:

I am closing this JIRA as the cause hit in this case appears to be one which includes a sufficient
explanation (you cannot have two nars with the same coordinates).  Further, nars are used
even for the framework itself.  Once we have the extension registry loading nars on demand
at runtime on top of a raw/base nifi kernel then this is more reasonable.  for now, the notion
of us choosing to ignore certain nars during loading from a static installation is not something
we intend to pursue.

> Nar loading should not impact the loading of NiFi overall
> ---------------------------------------------------------
>                 Key: NIFI-7781
>                 URL:
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>    Affects Versions: 1.11.4
>         Environment: Linux
>            Reporter: Joseph Kesselman
>            Priority: Major
>              Labels: exception-handling
>   Original Estimate: 24h
>  Remaining Estimate: 24h
> No matter what's broken about it, a bad nar should not be able to keep the rest of NiFi
from running. Catch and handle this exception. And preferably give us more information about
what the problem was than "unable to load" – was file not found, not a valid nar, in conflict
with other classes, written on a Thursday...
> 2020-08-31 23:58:20,960 ERROR [main] -> org.apache.nifi.NiFi -> Failure to launch
NiFi due to java.lang.IllegalStateException: Unable to load NAR with co
>  java.lang.IllegalStateException: Unable to load NAR with coordinates
and working directory ./work/nar/extension
>  at org.apache.nifi.nar.NarClassLoaders.load(
>  at org.apache.nifi.nar.NarClassLoaders.init(
>  at org.apache.nifi.NiFi.<init>(
>  at org.apache.nifi.NiFi.<init>(
>  at org.apache.nifi.NiFi.main(

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