Couchbase async data - spring-mvc

Question

I have written code to get async data from Couchbase views:
This is the Implementation Class
AsyncViewResult viewResult =
offerCouchDao.findViewResultAsync(DDN, VIEWNAME).toBlocking().single();
if (viewResult.success()) {
Observable<JsonArray> JAoffer =
offerCouchDao.getAsyncJsonObject(viewResult.rows());
Object response = offerCouchDao.getData(JAoffer);
System.out.println("Data is "+response);
return new OfferResponse(true,"Offer Data",response).toJson();
}
This is OfferCouchDao:
public Observable<AsyncViewResult> findViewResultAsync(String ddn, String viewname) {
ViewQuery allResult = ViewQuery.from(ddn, viewname);
return couchbaseManager.getMobikwikBucket().async().query(allResult);
}
public Observable<JsonArray> getAsyncJsonObject(Observable<AsyncViewRow> viewResult) {
return viewResult.
//extract the document from the row and carve a result object using its content and id
flatMap(new Func1<AsyncViewRow, Observable<JsonObject>>() {
#Override
public Observable<JsonObject> call(AsyncViewRow row) {
return row.document().map(new Func1<JsonDocument, JsonObject>() {
#Override
public JsonObject call(JsonDocument jsonDocument) {
return JsonObject.create()
.put("id", jsonDocument.id())
;
}
})
;
}
}).filter(new Func1<JsonObject, Boolean>() {
#Override
public Boolean call(JsonObject jsonObject) {
String name = jsonObject.getString("name");
return name != null ;
}
})
.collect(new Func0<JsonArray>() { //this creates the array (once)
#Override
public JsonArray call() {
return JsonArray.empty();
}
}, new Action2<JsonArray, JsonObject>() { //this populates the array (each item)
#Override
public void call(JsonArray objects, JsonObject jsonObject) {
objects.add(jsonObject);
}
});
}
public Object getData(Observable<JsonArray> jsonArraay) {
return jsonArraay
.map(new Func1<JsonArray, JsonArray>() {
#Override
public JsonArray call(JsonArray objects) {
return objects;
}
})
.onErrorReturn(new Func1<Throwable, JsonArray>() {
#Override
public JsonArray call(Throwable throwable) {
return null;
}
})
.toBlocking().single();
}
The issue I have is Data returned is null
Here are the logs:
Data is []
Data is null
Also when doing via sync call which is:
else {
JsonArray keys = JsonArray.create();
Iterator<ViewRow> iter = viewResult.rows();
while (iter.hasNext()) {
ViewRow row = iter.next();
JsonObject beer = JsonObject.create();
beer.put("name", row.key());
beer.put("id", row.id());
keys.add(beer);
}
}
I am getting the expected response.
Can Someone help me?