[infinispan-issues] [JBoss JIRA] (ISPN-4467) keySet operation via HotRod in compatibility mode throws ClassCastException

[Galder Zamarreño (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-4467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981510#comment-12981510 ] 

Galder Zamarreño commented on ISPN-4467:
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The reason this is failing now is due to ISPN-2284, which changed the way the cached entries are iterated. Before, cache.getAdvancedCache().withFlags(Flag.SKIP_CACHE_LOAD).keySet() was used which guaranteed that the correct transformations would happen as a result of keySet() going through the interceptor chain. Starting with ISPN-2284, the data container is hit directly passing in a task to iterate over the data container contents directly, avoiding the interceptor chain altogether.

> keySet operation via HotRod in compatibility mode throws ClassCastException
> ---------------------------------------------------------------------------
>
>                 Key: ISPN-4467
>                 URL: https://issues.jboss.org/browse/ISPN-4467
>             Project: Infinispan
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>            Reporter: Martin Gencur
>            Assignee: Galder Zamarreño
>             Fix For: 7.0.0.Alpha5
>
>
> The HotRod client's keySet() operation throws ClassCastException due to the following reason:
> When Encoder2x.scala in its writeResponse() method decodes the operation as BulkGetKeysResponse, it runs a Map/Reduce job that returns a set of keys in the whole cluster.
> The operation returns a set of "unmarshalled" (cos we're in compatibility mode) entries. However, Scala infers the type of individual entries as "Bytes" which is an alias for Array[Byte]. 
> As a result, when this iterator from this key set is retrieved, it is not possible to iterate through the entries because Scala automatically tries to convert each (unmarshalled) entry into a byte array, which results in the exception.
> This line results in throwing CCE:
> https://github.com/infinispan/infinispan/blob/master/server/hotrod/src/main/scala/org/infinispan/server/hotrod/Encoder2x.scala#L231
>  



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