java - Foursquare Api for venue search not working -

i new foursquare api. trying learn doing simple program print venues in given latitude , longitude. getting null pointer exception.

import fi.foyt.foursquare.api.foursquareapi; import fi.foyt.foursquare.api.foursquareapiexception; import fi.foyt.foursquare.api.result; import fi.foyt.foursquare.api.entities.compactvenue; import fi.foyt.foursquare.api.entities.venuessearchresult;  public class sample {      public venues venueslist = new venues();     public static void main(string[] args) {         // todo auto-generated method stub         try {             foursquareapi foursquareapi = new foursquareapi("f3bnuxlwufgtwkstwxq4mntyvf4csrmtdvqxzkfqub1xwbt0",                     "kkuwa3wsqozj2k1mpbbik3eqolota3kzjhvfppfzpr0vih4e", "http://www.eatin.com/redirect_uri");               string latitude = "+40.689060";              string  longitude = "-74.044636";             searchvenues(latitude+","+longitude,foursquareapi );         } catch (foursquareapiexception e) {             // todo auto-generated catch block             e.printstacktrace();         }      }      public static void searchvenues(string ll,foursquareapi foursquareapi1) throws foursquareapiexception {          result<venuessearchresult> result = foursquareapi1.venuessearch(ll, null, null, null, null, null, null,                 null, null, null, null);          if (result != null){             system.out.println("not null");             system.out.println(result.getresult());             venues venues = new venues();              (compactvenue venue : result.getresult().getvenues()) {                 venues.add(venue);             }             system.out.println("---------------start list------------");             (compactvenue venue : venues.getvenues()) {                 fi.foyt.foursquare.api.entities.location loc =  venue.getlocation();                 double lang = loc.getlat();                 double lng = loc.getlng();                 system.out.println("name: "+venue.getname());                  system.out.println("distance: "+venue.getlocation().getdistance());             }           }  } } 

venues. java

import java.util.collections; import java.util.linkedlist; import java.util.list;  import fi.foyt.foursquare.api.entities.compactvenue;  public class venues {     private list<compactvenue> venues = new linkedlist<compactvenue>();      public void add(compactvenue venue){         venues.add(venue);     }      @suppresswarnings("unchecked")     public list<compactvenue> getvenues(){         collections.sort(venues, new objectcomparator());         return venues;     }   } 

objectcomparable .java

 import java.util.comparator;  import fi.foyt.foursquare.api.entities.compactvenue;  import fi.foyt.foursquare.api.entities.compactvenue; import fi.foyt.foursquare.api.entities.location;  public class objectcomparator implements comparator{     public int compare(object obj1, object obj2) {          if (obj1 instanceof compactvenue && obj2 instanceof compactvenue){             compactvenue v1 = (compactvenue) obj1;             compactvenue v2 = (compactvenue) obj2;              double r = v1.getlocation().getdistance() - v2.getlocation().getdistance();              if (r > 0){                 return 1;             }             else if (r < 0){                 return -1;             }         }         return 0;     } } 

the output getting here is:

not null null exception in thread "main" java.lang.nullpointerexception     @ sample.searchvenues(sample.java:38)     @ sample.main(sample.java:20) 

can please tell me doing wrong here?? how can print venues on given co ordinates??