Program: 41142
Project: 41142
Buggy source:
@Override public void onMessage(Message message){
  try {
    int msgNumProperty=message.getIntProperty(MESSAGE_NUMBER);
    if (complete) {
      LOG.info("String_Node_Str" + msgNumProperty);
      return;
    }
    if (msgNumProperty == 1) {
      if (!seenFirstMessage) {
        LOG.info("String_Node_Str");
        seenFirstMessage=true;
      }
 else {
        LOG.info("String_Node_Str");
        if (message.getJMSRedelivered()) {
          LOG.info("String_Node_Str");
        }
 else {
          LOG.error("String_Node_Str");
          complete(true);
        }
        seenFirstMessageTwice=true;
      }
    }
 else     if (msgNumProperty == 2) {
      if (!seenSecondMessage) {
        seenSecondMessage=true;
        LOG.info("String_Node_Str");
        session.recover();
      }
 else {
        LOG.info("String_Node_Str");
        seenSecondMessageTwice=true;
        if (message.getJMSRedelivered()) {
          LOG.info("String_Node_Str");
        }
 else {
          LOG.error("String_Node_Str");
          complete(true);
        }
      }
    }
 else {
      if (msgNumProperty != 3) {
        LOG.error("String_Node_Str" + msgNumProperty);
        complete(true);
      }
      if (!seenFirstMessageTwice && !seenSecondMessageTwice) {
        LOG.error("String_Node_Str");
        complete(true);
      }
      if (message.getJMSRedelivered()) {
        LOG.error("String_Node_Str");
        complete(true);
      }
 else {
        LOG.info("String_Node_Str");
        complete(false);
      }
    }
  }
 catch (  JMSException e) {
    LOG.error("String_Node_Str",e);
    complete(true);
  }
}

Fixed version (ground truth):
@Override public void onMessage(Message message){
  try {
    int msgNumProperty=message.getIntProperty(MESSAGE_NUMBER);
    if (complete) {
      LOG.info("String_Node_Str" + msgNumProperty);
      return;
    }
    if (msgNumProperty == 1) {
      if (!seenFirstMessage) {
        LOG.info("String_Node_Str");
        seenFirstMessage=true;
      }
 else {
        LOG.info("String_Node_Str");
        if (message.getJMSRedelivered()) {
          LOG.info("String_Node_Str");
        }
 else {
          LOG.error("String_Node_Str");
          complete(true);
        }
        seenFirstMessageTwice=true;
      }
    }
 else     if (msgNumProperty == 2) {
      if (!seenSecondMessage) {
        seenSecondMessage=true;
        LOG.info("String_Node_Str");
        session.recover();
      }
 else {
        if (!seenFirstMessageTwice) {
          LOG.error("String_Node_Str");
          complete(true);
          return;
        }
        LOG.info("String_Node_Str");
        seenSecondMessageTwice=true;
        if (message.getJMSRedelivered()) {
          LOG.info("String_Node_Str");
        }
 else {
          LOG.error("String_Node_Str");
          complete(true);
        }
      }
    }
 else {
      if (msgNumProperty != 3) {
        LOG.error("String_Node_Str" + msgNumProperty);
        complete(true);
        return;
      }
      if (!(seenFirstMessageTwice && seenSecondMessageTwice)) {
        LOG.error("String_Node_Str");
        complete(true);
        return;
      }
      if (message.getJMSRedelivered()) {
        LOG.error("String_Node_Str");
        complete(true);
      }
 else {
        LOG.info("String_Node_Str");
        complete(false);
      }
    }
  }
 catch (  JMSException e) {
    LOG.error("String_Node_Str",e);
    complete(true);
  }
}