Program: 53716
Project: 53716
Buggy source:
@Override public void before(Object target,Object[] args){
  if (isDebug) {
    logger.beforeInterceptor(target,args);
  }
  final Trace trace=traceContext.currentRawTraceObject();
  if (trace == null) {
    return;
  }
  if (args.length == 0 || !(args[0] instanceof com.ning.http.client.Request)) {
    return;
  }
  final com.ning.http.client.Request httpRequest=(com.ning.http.client.Request)args[0];
  final boolean sampling=trace.canSampled();
  if (!sampling) {
    if (isDebug) {
      logger.debug("String_Node_Str");
    }
    if (httpRequest != null) {
      final FluentCaseInsensitiveStringsMap httpRequestHeaders=httpRequest.getHeaders();
      httpRequestHeaders.add(Header.HTTP_SAMPLED.toString(),SamplingFlagUtils.SAMPLING_RATE_FALSE);
    }
    return;
  }
  trace.traceBlockBegin();
  SpanEventRecorder recorder=trace.currentSpanEventRecorder();
  TraceId nextId=trace.getTraceId().getNextTraceId();
  recorder.recordNextSpanId(nextId.getSpanId());
  recorder.recordServiceType(NingAsyncHttpClientPlugin.ASYNC_HTTP_CLIENT);
  if (httpRequest != null) {
    final FluentCaseInsensitiveStringsMap httpRequestHeaders=httpRequest.getHeaders();
    putHeader(httpRequestHeaders,Header.HTTP_TRACE_ID.toString(),nextId.getTransactionId());
    putHeader(httpRequestHeaders,Header.HTTP_SPAN_ID.toString(),String.valueOf(nextId.getSpanId()));
    putHeader(httpRequestHeaders,Header.HTTP_PARENT_SPAN_ID.toString(),String.valueOf(nextId.getParentSpanId()));
    putHeader(httpRequestHeaders,Header.HTTP_FLAGS.toString(),String.valueOf(nextId.getFlags()));
    putHeader(httpRequestHeaders,Header.HTTP_PARENT_APPLICATION_NAME.toString(),traceContext.getApplicationName());
    putHeader(httpRequestHeaders,Header.HTTP_PARENT_APPLICATION_TYPE.toString(),Short.toString(traceContext.getServerTypeCode()));
    final String host=httpRequest.getURI().getHost();
    if (host != null) {
      putHeader(httpRequestHeaders,Header.HTTP_HOST.toString(),host);
    }
  }
}

Fixed version (ground truth):
@Override public void before(Object target,Object[] args){
  if (isDebug) {
    logger.beforeInterceptor(target,args);
  }
  final Trace trace=traceContext.currentRawTraceObject();
  if (trace == null) {
    return;
  }
  if (args.length == 0 || !(args[0] instanceof com.ning.http.client.Request)) {
    return;
  }
  final com.ning.http.client.Request httpRequest=(com.ning.http.client.Request)args[0];
  final boolean sampling=trace.canSampled();
  if (!sampling) {
    if (isDebug) {
      logger.debug("String_Node_Str");
    }
    if (httpRequest != null) {
      final FluentCaseInsensitiveStringsMap httpRequestHeaders=httpRequest.getHeaders();
      httpRequestHeaders.add(Header.HTTP_SAMPLED.toString(),SamplingFlagUtils.SAMPLING_RATE_FALSE);
    }
    return;
  }
  trace.traceBlockBegin();
  SpanEventRecorder recorder=trace.currentSpanEventRecorder();
  TraceId nextId=trace.getTraceId().getNextTraceId();
  recorder.recordNextSpanId(nextId.getSpanId());
  recorder.recordServiceType(NingAsyncHttpClientPlugin.ASYNC_HTTP_CLIENT);
  if (httpRequest != null) {
    final FluentCaseInsensitiveStringsMap httpRequestHeaders=httpRequest.getHeaders();
    putHeader(httpRequestHeaders,Header.HTTP_TRACE_ID.toString(),nextId.getTransactionId());
    putHeader(httpRequestHeaders,Header.HTTP_SPAN_ID.toString(),String.valueOf(nextId.getSpanId()));
    putHeader(httpRequestHeaders,Header.HTTP_PARENT_SPAN_ID.toString(),String.valueOf(nextId.getParentSpanId()));
    putHeader(httpRequestHeaders,Header.HTTP_FLAGS.toString(),String.valueOf(nextId.getFlags()));
    putHeader(httpRequestHeaders,Header.HTTP_PARENT_APPLICATION_NAME.toString(),traceContext.getApplicationName());
    putHeader(httpRequestHeaders,Header.HTTP_PARENT_APPLICATION_TYPE.toString(),Short.toString(traceContext.getServerTypeCode()));
    final String hostString=getEndpoint(httpRequest.getURI().getHost(),httpRequest.getURI().getPort());
    if (hostString != null) {
      putHeader(httpRequestHeaders,Header.HTTP_HOST.toString(),hostString);
    }
  }
}