[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:all-tabpanel ]

Galder Zamarreño reassigned ISPN-4467:
--------------------------------------

    Assignee: Galder Zamarreño  (was: Martin Gencur)


> 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
>
> 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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