ClassNameRegistryCreationFilter should optionally throw exception
When the ClassNameRegistryCreationFilter currently cannot find the directory or the mapping file, it logs an error and then returns. However, this behaviour makes it difficult to find out whether the import of a monitoring log was successful or not. Instead, the filter (and consequently the Dir2RecordsFilter as well) should provide a property or a constructor flag to switch the behaviour to: throw an actual exception in case of an error. This would lead to an ExecutionException thrown by the Execution, which then could be handled by the application.
(Version is 2.1)