output: #fixed code
                               private void updateGC() {
  		if (perfDataSupport) {
  			ygcCount.update((Long) ygcCountCounter.getValue());
  			ygcTimeMills.update(perfData.tickToMills(ygcTimeCounter));
  			fullgcCount.update((Long) fullGcCountCounter.getValue());
  			fullgcTimeMills.update(perfData.tickToMills(fullgcTimeCounter));
  		} else if (isJmxStateOk()) {
  			try {
  				ygcCount.update(jmxClient.getGarbageCollectorManager().getYoungCollector().getCollectionCount());
  				ygcTimeMills.update(jmxClient.getGarbageCollectorManager().getYoungCollector().getCollectionTime());
  				fullgcCount.update(jmxClient.getGarbageCollectorManager().getFullCollector().getCollectionCount());
  				fullgcTimeMills.update(jmxClient.getGarbageCollectorManager().getFullCollector().getCollectionTime());
  			} catch (Exception e) {
  				handleJmxFetchDataError(e);
  			}
  		}
  	}
input: #vulnerable code 
                               private void updateGC() {
  		if (perfDataSupport) {
  			ygcCount.update((Long) ygcCountCounter.getValue());
  			ygcTimeMills.update(perfData.tickToMills(ygcTimeCounter));
  			fullgcCount.update((Long) fullGcCountCounter.getValue());
  			fullgcTimeMills.update(perfData.tickToMills(fullgcTimeCounter));
  		} else if (isJmxStateOk()) {
  			try {
  				ygcCount.update(jmxClient.getYoungCollector().getCollectionCount());
  				ygcTimeMills.update(jmxClient.getYoungCollector().getCollectionTime());
  				fullgcCount.update(jmxClient.getFullCollector().getCollectionCount());
  				fullgcTimeMills.update(jmxClient.getFullCollector().getCollectionTime());
  			} catch (Exception e) {
  				handleJmxFetchDataError(e);
  			}
  		}
  	} 
                              #location 9 
                              #vulnerability type NULL_DEREFERENCE