class DagAConfV1{
    String person_id:
}

class DagBConfV1{
    String name:
}

MIGRATION_DATE LocalDate = LocalDate.parse("2016-06-12").atStartOfDay();
class DagBConfV2{
    String first_name:
}

Gson gson = new GsonBuilder().setPrettyPrinting().create();
JSONParser parse = new JSONParser();

dagruns_collection: DagRunCollection = client.getDagRuns()

for(DagRun nazwa_obiektu : dagruns_collection.getDagRuns()) {
    // Java idiomatic types
    if(dag_runs.dag_id == "DAG_ID") {
        DagAConfV1 empObject = gson.fromJson(dag_run.getConf(), DagAConfV1.class);
        // Do somethings
    } else (dag_runs.dag_id == "DAG_ID") {
        if(MIGRATION_DATE.isBefore(dag_run.getExecutionDate()))
            DagAConfV1 empObject = gson.fromJson(dag_run.getConf(), DagBConfV1.class);
            // Do somethings
        }else{
            DagAConfV1 empObject = gson.fromJson(dag_run.getConf(), DagBConfV2.class);
        }
    }else{
        // Dynamic typed object - Dynamic lnaguage idiomatic
         JSONObject jobj = (JSONObject) parse.parse(dag_run.getConf());
    }
}