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https://issues.apache.org/jira/browse/HADOOP-16503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16913383#comment-16913383
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Julia Kinga Marton commented on HADOOP-16503:
---------------------------------------------
[~adam.antal], as we have discussed offline, I can continue the work on this
issue, so I am assigning it to myself.
> [JDK11] TestLeafQueue tests are failing due to WrongTypeOfReturnValue
> ---------------------------------------------------------------------
>
> Key: HADOOP-16503
> URL: https://issues.apache.org/jira/browse/HADOOP-16503
> Project: Hadoop Common
> Issue Type: Sub-task
> Affects Versions: 3.2.0
> Reporter: Adam Antal
> Assignee: Adam Antal
> Priority: Major
> Attachments: HADOOP-16503.001.patch
>
>
> Many of the tests in
> {{org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestLeafQueue}}
> fails with the following error message running on JDK11:
> {noformat}
> [ERROR]
> testSingleQueueWithOneUser(org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestLeafQueue)
> Time elapsed: 0.204 s <<< ERROR!
> org.mockito.exceptions.misusing.WrongTypeOfReturnValue:
> YarnConfiguration cannot be returned by getRMNodes()
> getRMNodes() should return ConcurrentMap
> ***
> If you're unsure why you're getting above error read on.
> Due to the nature of the syntax above problem might occur because:
> 1. This exception *might* occur in wrongly written multi-threaded tests.
> Please refer to Mockito FAQ on limitations of concurrency testing.
> 2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub
> spies -
> - with doReturn|Throw() family of methods. More in javadocs for
> Mockito.spy() method.
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestLeafQueue.setUpInternal(TestLeafQueue.java:221)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestLeafQueue.setUp(TestLeafQueue.java:144)
> ...
> {noformat}
> This is due to the actual execution of the call, while we need to record only
> the invocation of it. According to the javadocs and other folks.
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