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Object columnsfields = getProperty("property_name");
if (columnsfields != null) {
    for (Object colObjfieldObj : (Object[]) columnsfields) {
        Map colfield = (Map) colObjfieldObj;
        String col1field1_value = (String) optfield.get("col1field1_key");
        String col2field2_value = (String) optfield.get("col2field2_key");
    }
}