EDIT

    public static final String DATA_SINGLE = "single.xls";

    public static final String DATA_FILE = DATA_FILE_FULL;

    //database validation status (create, update, validate ...)

    static DbSchemaValidation hbm2dll = DbSchemaValidation.CREATE;

        config.setSourceReference(sourceRef);

        config.setSecReference(secRef);

        config.setProgressMonitor(DefaultProgressMonitor.NewInstance());

        // config.setBatchSize(100); // causes Error during managed flush [Don't change the reference to a collection with delete-orphan enabled : eu.etaxonomy.cdm.model.taxon.TaxonNode.annotations]

        CdmDefaultImport<IAPTImportConfigurator> myImport = new CdmDefaultImport<>();