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https://issues.apache.org/jira/browse/CASSANDRA-16304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17609610#comment-17609610
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Ekaterina Dimitrova commented on CASSANDRA-16304:
-------------------------------------------------

For the record, these were some tests identified to hit the issue when running 
with jdk 17 as part of POC in CASSANDRA-16895:

_testPreparedBatch, testReprepareNewBehaviour, testUseWithMultipleKeyspaces, 
testReprepareTwoKeyspacesNewBehaviour, fuzzTest, startupNewIP, 
sameIPFailWithoutReplace, sameIPFailWithoutReplace, mixedModeFuzzTest_

> Consider implementing ClusteringComparator without a lambda
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-16304
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16304
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Build
>            Reporter: Adrian Cole
>            Priority: Normal
>             Fix For: 4.x
>
>
> Using lambdas forces jamm to do things that can easily break. It might be 
> safer to implement things like ClusteringComparator directly as classes or as 
> an enum
> {noformat}
> Unexpected exception during request 
> (org.apache.cassandra.transport.messages.ErrorMessage)
> java.lang.UnsupportedOperationException: can't get field offset on a hidden 
> class: private final org.apache.cassandra.db.ClusteringComparator 
> org.apache.cassandra.db.ClusteringComparator$$Lambda$165/0x000000010028ab60.arg$1
>       at jdk.unsupported/sun.misc.Unsafe.objectFieldOffset(Unknown Source)
>       at 
> org.github.jamm.MemoryLayoutSpecification.sizeOfInstanceWithUnsafe(MemoryLayoutSpecification.java:108)
>       at 
> org.github.jamm.MemoryLayoutSpecification.sizeOfWithUnsafe(MemoryLayoutSpecification.java:89)
>       at org.github.jamm.MemoryMeter.measure(MemoryMeter.java:217)
>       at org.github.jamm.MemoryMeter.measureDeep(MemoryMeter.java:259)
>       at 
> org.apache.cassandra.utils.ObjectSizes.measureDeep(ObjectSizes.java:155)
>       at 
> org.apache.cassandra.cql3.QueryProcessor.storePreparedStatement(QueryProcessor.java:454)
>       at 
> org.apache.cassandra.cql3.QueryProcessor.prepare(QueryProcessor.java:424)
>       at 
> org.apache.cassandra.cql3.QueryProcessor.prepare(QueryProcessor.java:408)
>       at 
> org.apache.cassandra.transport.messages.PrepareMessage.execute(PrepareMessage.java:114)
>       at 
> org.apache.cassandra.transport.Message$Request.execute(Message.java:253)
>       at 
> org.apache.cassandra.transport.Message$Dispatcher.processRequest(Message.java:725)
>       at 
> org.apache.cassandra.transport.Message$Dispatcher.lambda$channelRead0$0(Message.java:630)
>       at 
> java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
>       at 
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
>       at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:119)
>       at 
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
>       at java.base/java.lang.Thread.run(Unknown Source)
> {noformat}



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