Bryan Bende created NIFI-6055:
---------------------------------
Summary: Improve error handling during auto-loading of NARs
Key: NIFI-6055
URL: https://issues.apache.org/jira/browse/NIFI-6055
Project: Apache NiFi
Issue Type: Improvement
Affects Versions: 1.9.0
Reporter: Bryan Bende
Assignee: Bryan Bende
If you copy in several NARs where one of them has a framework level extension
like an authorizers, repository, or state manager, it will produce an exception
like the following:
{code:java}
2019-02-19 10:37:20,397 ERROR [NAR Auto-Loader]
org.apache.nifi.nar.NarAutoLoaderTask Error loading NARs due to: Attempt was
made to load org.apache.nifi.provenance.PersistentProvenanceRepository from
org.apache.nifi:nifi-provenance-repository-nar:1.9.0-SNAPSHOT but that class
name is already loaded/registered from
org.apache.nifi:nifi-provenance-repository-nar:1.9.0 and multiple versions are
not supported for this type
java.lang.IllegalStateException: Attempt was made to load
org.apache.nifi.provenance.PersistentProvenanceRepository from
org.apache.nifi:nifi-provenance-repository-nar:1.9.0-SNAPSHOT but that class
name is already loaded/registered from
org.apache.nifi:nifi-provenance-repository-nar:1.9.0 and multiple versions are
not supported for this type
at
org.apache.nifi.nar.StandardExtensionDiscoveringManager.registerServiceClass(StandardExtensionDiscoveringManager.java:289)
at
org.apache.nifi.nar.StandardExtensionDiscoveringManager.loadExtensions(StandardExtensionDiscoveringManager.java:181)
at
org.apache.nifi.nar.StandardExtensionDiscoveringManager.discoverExtensions(StandardExtensionDiscoveringManager.java:127)
at
org.apache.nifi.nar.StandardNarLoader.load(StandardNarLoader.java:110)
at org.apache.nifi.nar.NarAutoLoaderTask.run(NarAutoLoaderTask.java:128)
at java.lang.Thread.run(Thread.java:748){code}
The exception itself is not an issue because it is correct that we don't
support multiple versions of these types of extensions.
The issue is that during the auto-loading process we call discoverExtensions on
a set of bundles:
{code:java}
extensionManager.discoverExtensions(loadedBundles);{code}
If the above exception happens during this call, it will bounce out and not
discover any other extensions that may still be available for loading.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
