Program: 20544
Project: 20544
Buggy source:
@Override public Notification newEventNotification(final Event eventIn,String eventLink){
  Event event=eventManager.loadById(eventIn.getId(),Event_.venue,Event_.team,AbstractSoccerEvent_.uniform,Match_.opponent);
  Notification notification=new Notification();
  final Map<String,Object> model=new HashMap<String,Object>();
  model.put("String_Node_Str",event);
  model.put("String_Node_Str",Dates.formatDateMedium(event.getDate()));
  model.put("String_Node_Str",Dates.formatTimeShort(event.getTime()));
  model.put("String_Node_Str",Dates.formatDateTimeShort(event.getDateTime()));
  model.put("String_Node_Str",EventType.Match);
  model.put("String_Node_Str",eventLink);
  model.put("String_Node_Str",EventType.isSoccerEvent(event));
  if (event.getVenue() != null) {
    model.put("String_Node_Str",Links.getDirectionsLink(event.getVenue()));
  }
  if (EventType.isSoccerEvent(event)) {
    AbstractSoccerEvent soccerEvent=(AbstractSoccerEvent)event;
    model.put("String_Node_Str",Dates.formatTimeShort(soccerEvent.getKickoff()));
    model.put("String_Node_Str",Surface.render(soccerEvent.getSurfaceList()));
    if (soccerEvent.getUniform() != null) {
      model.put("String_Node_Str",new StringResourceModel("String_Node_Str",Model.of(soccerEvent.getUniform())).getObject());
    }
  }
  notification.setSubject(templateService.mergeTemplate(EmailTemplate.NOTIFICATION_EVENT.getSubject(),model));
  notification.setBody(templateService.mergeTemplate(EmailTemplate.NOTIFICATION_EVENT.getContent(),model));
  return notification;
}

Fixed version (ground truth):
@Override public Notification newEventNotification(final Event eventIn,String eventLink){
  Event event=eventManager.loadById(eventIn.getId(),Event_.venue,Event_.team,AbstractSoccerEvent_.uniform,Match_.opponent);
  Notification notification=new Notification();
  final Map<String,Object> model=new HashMap<String,Object>();
  model.put("String_Node_Str",event);
  model.put("String_Node_Str",Dates.formatDateMedium(event.getDate()));
  model.put("String_Node_Str",Dates.formatTimeShort(event.getTime()));
  model.put("String_Node_Str",Dates.formatDateTimeShort(event.getDateTime()));
  model.put("String_Node_Str",new ResourceModel(event.getEventType().getResourceKey()).getObject());
  model.put("String_Node_Str",EventType.Match);
  model.put("String_Node_Str",eventLink);
  model.put("String_Node_Str",EventType.isSoccerEvent(event));
  if (event.getVenue() != null) {
    model.put("String_Node_Str",Links.getDirectionsLink(event.getVenue()));
  }
  if (EventType.isSoccerEvent(event)) {
    AbstractSoccerEvent soccerEvent=(AbstractSoccerEvent)event;
    model.put("String_Node_Str",Dates.formatTimeShort(soccerEvent.getKickoff()));
    model.put("String_Node_Str",Surface.render(soccerEvent.getSurfaceList()));
    if (soccerEvent.getUniform() != null) {
      model.put("String_Node_Str",new StringResourceModel("String_Node_Str",Model.of(soccerEvent.getUniform())).getObject());
    }
  }
  notification.setSubject(templateService.mergeTemplate(EmailTemplate.NOTIFICATION_EVENT.getSubject(),model));
  notification.setBody(templateService.mergeTemplate(EmailTemplate.NOTIFICATION_EVENT.getContent(),model));
  return notification;
}