Adam Antal created YARN-9813:
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Summary: 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
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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