public <T extends  RealmModel > void checkOfflineData(){


    Realm realm = Realm.getDefaultInstance();

    Set<Class<? extends RealmModel>> realmObjectClasses = realm.getConfiguration().getRealmObjectClasses();

    for(Class modelClass: realmObjectClasses) {

            // fetch non synced data

            RealmResults realmResults = getNotSynced(realm,modelClass);
            if(realmResults !=null && realmResults.size() > 0){

                //build a request
                Request<T> request = new Request<T>();
                RealmList<T> realmList = new RealmList<T>();
                //add results to list
                realmList.addAll(realmResults.subList(0, realmResults.size()));
                request.setRequestList(realmList);

            }
    }

    // Parsing using GSON data


    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(Request.class, new RequestSerializer());
    Gson gson = builder.create();
    String data = gson.toJson(request);



}

public class Request<T>  {

private RealmList<T> requestList;

public RealmList<T> getRequestList() {
    return requestList;
}

public void setRequestList(RealmList<T> requestList) {
    this.requestList = requestList;
}

07-17 13:04:00.177 6076-6076/com.org.connectedhealth W/System.err: Caused by: java.lang.StackOverflowError: stack size 8MB
        at java.lang.reflect.Field.get(Native Method)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.writeField(ReflectiveTypeAdapterFactory.java:138)
07-17 13:04:00.178 6076-6076/com.org.connectedhealth W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:243)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69)
        at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.write(MapTypeAdapterFactory.java:208)
        at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.write(MapTypeAdapterFactory.java:145)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127)
07-17 13:04:00.179 6076-6076/com.org.connectedhealth W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69)
07-17 13:04:00.180 6076-6076/com.org.connectedhealth W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127)