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https://issues.apache.org/jira/browse/YARN-9512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16847689#comment-16847689
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Adam Antal commented on YARN-9512:
----------------------------------
I made some investigation, but don't have a proposed solutions to this.
Some related articles and stuff:
- It is a known [migration
problem|https://blog.codefx.org/java/java-9-migration-guide/#Casting-To-URL-Class-Loader]
from Java 8 to 9. This article says some case where the migration is easy, but
non of them is applicable here.
- The [Oracle community|https://community.oracle.com/thread/4011800] has also
got a thread about this problem, might worth chasing that option they suggested.
Most likely it is just a testing issue, but I am still unsure about this.
I'm also CC [~billie.rinaldi], as had some work around this area. If you have
any thoughts on this, we'd be happy.
Also other components bumped into this - similar: TEZ-3860.
> [JDK11] TestAuxServices#testCustomizedAuxServiceClassPath ClassCastException:
> class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class
> java.net.URLClassLoader
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-9512
> URL: https://issues.apache.org/jira/browse/YARN-9512
> Project: Hadoop YARN
> Issue Type: Bug
> Components: test
> Reporter: Siyao Meng
> Assignee: Adam Antal
> Priority: Major
>
> Found in maven JDK 11 unit test run. Compiled on JDK 8:
> {code}
> [ERROR]
> testCustomizedAuxServiceClassPath(org.apache.hadoop.yarn.server.nodemanager.containermanager.TestAuxServices)
> Time elapsed: 0.019 s <<< ERROR!java.lang.ClassCastException: class
> jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class
> java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and
> java.net.URLClassLoader are in module java.base of loader 'bootstrap')
> at
> org.apache.hadoop.yarn.server.nodemanager.containermanager.TestAuxServices$ServiceC.getMetaData(TestAuxServices.java:197)
> at
> org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxServices.serviceStart(AuxServices.java:315)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
> at
> org.apache.hadoop.yarn.server.nodemanager.containermanager.TestAuxServices.testCustomizedAuxServiceClassPath(TestAuxServices.java:344)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
> {code}
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