Program: 55874
Project: 55874
Buggy source:
/** 
 * Called by the attached output channel wrapper to forward a   {@link TransferEnvelope} objectto its final destination. Within this method the provided transfer envelope is possibly also forwarded to the assigned ephemeral checkpoint.
 * @param channelWrapper the channel wrapper which called this method
 * @param outgoingTransferEnvelope the transfer envelope to be forwarded
 * @throws IOException thrown if an I/O error occurs while processing the envelope
 * @throws InterruptedException thrown if the thread is interrupted while waiting for the envelope to be processed
 */
public void processEnvelope(ByteBufferedOutputChannelWrapper channelWrapper,TransferEnvelope outgoingTransferEnvelope) throws IOException, InterruptedException {
  final TransferEnvelopeProcessingLog processingLog=outgoingTransferEnvelope.getProcessingLog();
  if (this.ephemeralCheckpoint != null && processingLog.mustBeWrittenToCheckpoint()) {
    this.ephemeralCheckpoint.addTransferEnvelope(outgoingTransferEnvelope);
    final EventList eventList=outgoingTransferEnvelope.getEventList();
    if (!eventList.isEmpty()) {
      final Iterator<AbstractEvent> it=eventList.iterator();
      while (it.hasNext()) {
        if (it.next() instanceof ByteBufferedChannelCloseEvent) {
          this.ephemeralCheckpoint.markChannelAsFinished(outgoingTransferEnvelope.getSource());
          if (this.ephemeralCheckpoint.isPersistent()) {
            channelWrapper.processEvent(new ByteBufferedChannelCloseEvent());
          }
          break;
        }
      }
    }
  }
  if (processingLog.mustBeSentViaNetwork() && !processingLog.isSentViaNetwork()) {
    this.byteBufferedChannelManager.queueOutgoingTransferEnvelope(outgoingTransferEnvelope);
  }
  if (outgoingTransferEnvelope.getBuffer() != null) {
    this.channelsWithWriteBuffers.remove(channelWrapper);
  }
}

Fixed version (ground truth):
/** 
 * Called by the attached output channel wrapper to forward a   {@link TransferEnvelope} objectto its final destination. Within this method the provided transfer envelope is possibly also forwarded to the assigned ephemeral checkpoint.
 * @param channelWrapper the channel wrapper which called this method
 * @param outgoingTransferEnvelope the transfer envelope to be forwarded
 * @throws IOException thrown if an I/O error occurs while processing the envelope
 * @throws InterruptedException thrown if the thread is interrupted while waiting for the envelope to be processed
 */
public void processEnvelope(ByteBufferedOutputChannelWrapper channelWrapper,TransferEnvelope outgoingTransferEnvelope) throws IOException, InterruptedException {
  final TransferEnvelopeProcessingLog processingLog=outgoingTransferEnvelope.getProcessingLog();
  if (this.ephemeralCheckpoint != null && processingLog.mustBeWrittenToCheckpoint()) {
    this.ephemeralCheckpoint.addTransferEnvelope(outgoingTransferEnvelope);
    final EventList eventList=outgoingTransferEnvelope.getEventList();
    if (!eventList.isEmpty()) {
      final Iterator<AbstractEvent> it=eventList.iterator();
      while (it.hasNext()) {
        if (it.next() instanceof ByteBufferedChannelCloseEvent && this.commonChannelType == ChannelType.FILE) {
          ;
          System.out.println("String_Node_Str" + outgoingTransferEnvelope.getSequenceNumber() + "String_Node_Str"+ outgoingTransferEnvelope.getSource());
          this.ephemeralCheckpoint.markChannelAsFinished(outgoingTransferEnvelope.getSource(),outgoingTransferEnvelope.getSequenceNumber());
          if (this.ephemeralCheckpoint.isPersistent() && this.commonChannelType == ChannelType.FILE) {
            channelWrapper.processEvent(new ByteBufferedChannelCloseEvent());
          }
          break;
        }
      }
    }
  }
  if (processingLog.mustBeSentViaNetwork() && !processingLog.isSentViaNetwork()) {
    this.byteBufferedChannelManager.queueOutgoingTransferEnvelope(outgoingTransferEnvelope);
  }
  if (outgoingTransferEnvelope.getBuffer() != null) {
    this.channelsWithWriteBuffers.remove(channelWrapper);
  }
}