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https://issues.apache.org/jira/browse/YARN-9813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16924699#comment-16924699
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Hudson commented on YARN-9813:
------------------------------
FAILURE: Integrated in Jenkins build Hadoop-trunk-Commit #17251 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/17251/])
YARN-9813. RM does not start on JDK11 when UIv2 is enabled. (Adam (wangda: rev
34b82e6da0a471010cdae613ba39487889d79369)
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ResourceManager.java
> 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,
> YARN-9813.003.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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