android - Alarm not triggering -

i've worked alarms many times, can't life of me trigger... doing wrong? i've tried triggering services, broadcastreceivers, everything. i've tried triggering earlier time , in future (5 seconds now). far know it's being set, it's not throwing error , log firing... nothing in alarmreceiver getting triggered.

public void setalarm() {             calendar exp = calendar.getinstance();             exp.set(calendar.second, 5);              alarmmanager = (alarmmanager)mcontext.getsystemservice(context.alarm_service);             am.set(alarmmanager.rtc_wakeup, exp.gettimeinmillis(),  pendingintent.getservice(mcontext, 0, new intent(mcontext, alarmreceiver.class), 0));             log.i("", "alarm set " + dateformat.format("mmmm dd, yyyy hh:mma", exp.gettime()));          }      } 

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public class alarmreceiver extends service {      @override     public ibinder onbind(intent intent) {         log.d("", "onbind tiggered");         return null;     }      public void oncreate() {         log.d("", "oncreate triggered");     } } 

don't forget add service manifest!!