java - No output from Google Endpoints API -

i trying retrieve entities called 'blayer' stored in datastore. running ok without error, not returning anything. @ end of road here. since part of backend, can't stepwise debug either. here endpoints code:

@apimethod(name = "getblayers") public arraylist<arraylist<blayer>> getblayers(@named ("bnames") arraylist<string> bnames) {     asyncdatastoreservice datastoreservice = datastoreservicefactory.getasyncdatastoreservice();     key blayerparentkey = keyfactory.createkey("tour",tour_name);     arraylist<blayer> blayers = new arraylist<blayer>();     arraylist<arraylist<blayer>> blayersgamelist = new arraylist<arraylist<blayer>>();     arraylist<list<entity>> resultsall=new arraylist<>();     arraylist<string> realnames = new arraylist<string>(arrays.aslist(bnames.get(0).split(",")));      if(bnames.size()==1){         bnames=realnames;     }     future<transaction> transactionfuture=datastoreservice.begintransaction();     int i=0;     (string bname :bnames) {         query query = new query("blayer", blayerparentkey);         query.filter propertyfilter = new query.filterpredicate("bname", query.filteroperator.equal, bname.touppercase());         query.setfilter(propertyfilter);         //query.addsort("matchtime", query.sortdirection.descending);         resultsall.add(i, datastoreservice.prepare(query).aslist(fetchoptions.builder.withdefaults()));         i++;     }     try{         transactionfuture.get().commit();     }catch (interruptedexception|executionexception e){         blayer blayer = new blayer();         blayer.setbname(bnames.get(0));         blayer.setgameid(0);         blayer.setblayerscore(0);         blayer.sethisteam("");         blayer.setagainstteam(e.getmessage());         blayers.add(blayer);         return blayersgamelist;     }     i=0;     (string bname : bnames){         list<entity> results=resultsall.get(i);         if (!resultsall.get(i).isempty()) {             (entity result : results) {                 blayer blayer = new blayer();                 blayer.setbname(result.getproperty("bname").tostring());                 blayer.setgameid((long) result.getproperty("gameid"));                 blayer.setblayerscore((long) result.getproperty("blayerscore"));                 blayer.sethisteam((string) result.getproperty("histeam"));                 blayer.setagainstteam((string) result.getproperty("againstteam"));                 blayer.setmatchtime((date) result.getproperty("matchtime"));                 blayers.add(blayer);             }         } else {             blayer blayer = new blayer();             blayer.setbname(bname);             blayer.setgameid(realnames.size());             blayer.setblayerscore(bnames.size());             blayer.sethisteam(bnames.get(0)+";;; "+blayersgamelist.size()+",,,"+blayers.size());             blayer.setagainstteam("no match played");             blayers.add(blayer);         }         blayersgamelist.add(i,blayers);         blayers.clear();         i++;     }      return blayersgamelist; }