Github user jtstorck commented on a diff in the pull request: https://github.com/apache/nifi/pull/1539#discussion_r103770451 --- Diff: nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-nar-utils/src/main/java/org/apache/nifi/nar/ExtensionManager.java --- @@ -199,8 +199,20 @@ public static ClassLoader getClassLoader(final String classType, final String in // then make a new InstanceClassLoader that is a full copy of the NAR Class Loader, otherwise create an empty // InstanceClassLoader that has the NAR ClassLoader as a parent if (requiresInstanceClassLoading.contains(classType) && (registeredClassLoader instanceof URLClassLoader)) { - final URLClassLoader registeredUrlClassLoader = (URLClassLoader) registeredClassLoader; - instanceClassLoader = new InstanceClassLoader(instanceIdentifier, classType, registeredUrlClassLoader.getURLs(), registeredUrlClassLoader.getParent()); + final Set<URL> classLoaderResources = new HashSet<>(); + + // if the registered class loader is a NAR class loader then walk the chain of class loaders until + // finding a non-NAR class loader, and build up a list of all URLs along the way + while (registeredClassLoader != null && registeredClassLoader instanceof NarClassLoader) { + final NarClassLoader narClassLoader = (NarClassLoader) registeredClassLoader; + for (URL classLoaderResource : narClassLoader.getURLs()) { + classLoaderResources.add(classLoaderResource); + } + registeredClassLoader = narClassLoader.getParent(); + } --- End diff -- @olegz This PR will be updated with a different approach. This change will be reverted, overall.
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