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https://issues.apache.org/jira/browse/YARN-9813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16924147#comment-16924147
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Adam Antal commented on YARN-9813:
----------------------------------
Forget to remove unused import, removed in patch v2.
> RM does not start on JDK11 when UIv2 is enabled
> -----------------------------------------------
>
> Key: YARN-9813
> URL: https://issues.apache.org/jira/browse/YARN-9813
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager, yarn
> Affects Versions: 3.1.2
> Reporter: Adam Antal
> Assignee: Adam Antal
> Priority: Critical
> Attachments: YARN-9813.001.patch, YARN-9813.002.patch
>
>
> Starting a ResourceManager on JDK11 with UIv2 is enabled, RM startup fails
> with the following message:
> {noformat}
> Error starting ResourceManager
> java.lang.ClassCastException: class
> jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class
> java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and
> java.net.URLClassLoader are in module java.base of loader 'bootstrap')
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.startWepApp(ResourceManager.java:1190)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStart(ResourceManager.java:1333)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1531)
> {noformat}
> It is a known issue that the systemClassLoader is not URLClassLoader anymore
> from JDK9 (see related UT failure: YARN-9512).
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