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https://issues.apache.org/jira/browse/NIFI-7923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17221555#comment-17221555
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ASF subversion and git services commented on NIFI-7923:
-------------------------------------------------------
Commit e7f244f267172e0307f21e60504982717d0a431a in nifi's branch
refs/heads/main from Bryan Bende
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=e7f244f ]
NIFI-7923 Catch Throwable instead of Exception in NarAutoLoaderTask so that
thread won't die (#4623)
> Nar Auto-Loader cannot recover from Throwable/Error
> ---------------------------------------------------
>
> Key: NIFI-7923
> URL: https://issues.apache.org/jira/browse/NIFI-7923
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.12.0
> Reporter: Nick Lawrence
> Assignee: Bryan Bende
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When a nar is built against an up-level JVM, a java Error is thrown while
> loading the nar extension. The Throwable is not handled as the code only
> handles sub classes of Exception. As a result the thread dies, and when a
> corrected nar is later installed, the nar cannot be loaded. Restart of nifi
> causes the updated nar to be loaded.
> 2020-10-14 13:31:55,340 INFO [NAR Auto-Loader] ->
> org.apache.nifi.nar.NarClassLoaders -> Loaded NAR file:
> /opt/nifi/./work/nar/extensions/nifi-hri-nar-1.0-SNAPSHOT.nar-unpacked as
> class loader
> org.apache.nifi.nar.NarClassLoader[./work/nar/extensions/nifi-hri-nar-1.0-SNAPSHOT.nar-unpacked]
> 2020-10-14 13:31:55,342 INFO [NAR Auto-Loader] ->
> org.apache.nifi.nar.StandardNarLoader -> Successfully created class loaders
> for 1 NARs, 0 were skipped
> 2020-10-14 13:31:55,395 ERROR [NAR Auto-Loader] -> org.apache.nifi.NiFi -> An
> Unknown Error Occurred in Thread Thread[NAR Auto-Loader,5,main]:
> java.lang.UnsupportedClassVersionError:
> com/ibm/watson/health/wffh/nifi/processors/hri/GetHriIngestRecords has been
> compiled by a more recent version of the Java Runtime (class file version
> 55.0), this version of the Java Runtime only recognizes class file versions
> up to 52.0
> 2020-10-14 13:31:55,396 ERROR [NAR Auto-Loader] -> org.apache.nifi.NiFi ->
> java.lang.UnsupportedClassVersionError:
> com/ibm/watson/health/wffh/nifi/processors/hri/GetHriIngestRecords has been
> compiled by a more recent version of the Java Runtime (class file version
> 55.0), this version of the Java Runtime only recognizes class file versions
> up to 52.0
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
> at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
> at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
> at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:348)
> at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:370)
> at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)
> at java.util.ServiceLoader$1.next(ServiceLoader.java:480)
> at
> org.apache.nifi.nar.StandardExtensionDiscoveringManager.loadExtensions(StandardExtensionDiscoveringManager.java:156)
> at
> org.apache.nifi.nar.StandardExtensionDiscoveringManager.discoverExtensions(StandardExtensionDiscoveringManager.java:131)
> 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)
> I looked at the source enough to believe that the Error is not handled
> anywhere between StandardExtensionDiscovingManager.loadExtensions and
> NarAutoLoaderTask.run.
> I see no messages in the log that suggest that the updated nar is processed
> after it is placed in the extensions directory.
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