Hi, Looks like a command can uniquely be identified by two ids. E.g. @Marshallable(externalizer = ReplicableCommandExternalizer.class, id = Ids.REMOVE_COMMAND) public class RemoveCommand extends AbstractDataWriteCommand { ... public static final byte COMMAND_ID = 10; ... It has an Marshallable id and an command id. Can't we just use one of them? Ids.REMOVE_COMMAND is my favourite as this way one can see the ids for all commands in a single place. Cheers, Mircea _______________________________________________ infinispan-dev mailing list infinispan-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/infinispan-dev