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: Martin Gencur 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/ma...