[jira] [Created] (NIFI-6055) Improve error handling during auto-loading of NARs

["Bryan Bende (JIRA)" <ji...@apache.org>]

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.

 



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