Program: 93455
Project: 93455
Buggy source:
@Override public void transform(HttpServerExchange exchange,RequestContext context,BsonValue contentToTransform,BsonValue args){
  if (!context.isInError() && (context.getType() == TYPE.DOCUMENT || context.getType() == TYPE.FILE || context.getType() == TYPE.INDEX)) {
    return;
  }
  RequestContext.REPRESENTATION_FORMAT rf=context.getRepresentationFormat();
  if (rf == null) {
    rf=Bootstrapper.getConfiguration().getDefaultRepresentationFormat();
  }
  if (contentToTransform == null || (rf != RequestContext.REPRESENTATION_FORMAT.PJ && rf != RequestContext.REPRESENTATION_FORMAT.PLAIN_JSON)) {
    return;
  }
  BsonDocument responseContent=new BsonDocument();
  context.setResponseContentType(Representation.JSON_MEDIA_TYPE);
  if (contentToTransform.isDocument()) {
    BsonValue _embedded=contentToTransform.asDocument().get("String_Node_Str");
    if (_embedded != null) {
      BsonDocument embedded=_embedded.asDocument();
      BsonArray __embedded=new BsonArray();
      addItems(__embedded,embedded,"String_Node_Str");
      addItems(__embedded,embedded,"String_Node_Str");
      addItems(__embedded,embedded,"String_Node_Str");
      addItems(__embedded,embedded,"String_Node_Str");
      addItems(__embedded,embedded,"String_Node_Str");
      addItems(__embedded,embedded,"String_Node_Str");
      if (context.getMethod() == METHOD.GET && context.getResponseStatusCode() == HttpStatus.SC_OK) {
        responseContent.append("String_Node_Str",__embedded);
      }
      BsonArray _results=new BsonArray();
      addItems(_results,embedded,"String_Node_Str");
      if (!_results.isEmpty()) {
        responseContent.append("String_Node_Str",_results);
      }
      BsonArray _errors=new BsonArray();
      addItems(_errors,embedded,"String_Node_Str");
      if (!_errors.isEmpty()) {
        responseContent.append("String_Node_Str",_errors);
      }
      BsonArray _exception=new BsonArray();
      addItems(_exception,embedded,"String_Node_Str");
      if (!_exception.isEmpty()) {
        responseContent.append("String_Node_Str",_exception);
      }
      BsonArray _warnings=new BsonArray();
      addItems(_warnings,embedded,"String_Node_Str");
      if (!_warnings.isEmpty()) {
        responseContent.append("String_Node_Str",_warnings);
      }
    }
 else     if (context.getMethod() == METHOD.GET && context.getResponseStatusCode() == HttpStatus.SC_OK) {
      responseContent.append("String_Node_Str",new BsonArray());
    }
  }
  if (!context.isNoProps() || context.isInError()) {
    contentToTransform.asDocument().keySet().stream().filter(key -> !"String_Node_Str".equals(key) && !"String_Node_Str".equals(key)).forEach(key -> responseContent.append(key,contentToTransform.asDocument().get(key)));
    context.setResponseContent(responseContent);
  }
 else   if (!context.isInError()) {
    if (responseContent.get("String_Node_Str") != null && !responseContent.get("String_Node_Str").asArray().isEmpty()) {
      context.setResponseContent(responseContent.get("String_Node_Str"));
    }
 else     if (responseContent.get("String_Node_Str") != null && !responseContent.get("String_Node_Str").asArray().isEmpty()) {
      context.setResponseContent(responseContent.get("String_Node_Str"));
    }
 else     if (responseContent.get("String_Node_Str") != null) {
      context.setResponseContent(responseContent.get("String_Node_Str"));
    }
 else     if (responseContent.get("String_Node_Str") != null && !responseContent.get("String_Node_Str").asArray().isEmpty()) {
      context.setResponseContent(responseContent.get("String_Node_Str"));
    }
 else {
      context.setResponseContent(null);
    }
  }
 else {
    context.setResponseContent(responseContent);
  }
}

Fixed version (ground truth):
@Override public void transform(HttpServerExchange exchange,RequestContext context,BsonValue contentToTransform,BsonValue args){
  if (!context.isInError() && (context.getType() == TYPE.DOCUMENT || context.getType() == TYPE.FILE || context.getType() == TYPE.INDEX)) {
    return;
  }
  RequestContext.REPRESENTATION_FORMAT rf=context.getRepresentationFormat();
  if (rf == null) {
    rf=Bootstrapper.getConfiguration().getDefaultRepresentationFormat();
  }
  if (contentToTransform == null || (rf != RequestContext.REPRESENTATION_FORMAT.PJ && rf != RequestContext.REPRESENTATION_FORMAT.PLAIN_JSON)) {
    return;
  }
  context.setResponseContentType(Representation.JSON_MEDIA_TYPE);
  BsonDocument responseContent=new BsonDocument();
  transformError(contentToTransform,responseContent);
  if (context.isInError()) {
    contentToTransform.asDocument().keySet().stream().filter(key -> !"String_Node_Str".equals(key) && !"String_Node_Str".equals(key)).forEach(key -> responseContent.append(key,contentToTransform.asDocument().get(key)));
    context.setResponseContent(responseContent);
  }
 else   if (context.getMethod() == METHOD.GET) {
    transformRead(context,contentToTransform,responseContent);
    if (!context.isNoProps()) {
      contentToTransform.asDocument().keySet().stream().filter(key -> !"String_Node_Str".equals(key) && !"String_Node_Str".equals(key)).forEach(key -> responseContent.append(key,contentToTransform.asDocument().get(key)));
      context.setResponseContent(responseContent);
    }
 else {
      if (responseContent.get("String_Node_Str") != null) {
        context.setResponseContent(responseContent.get("String_Node_Str"));
      }
 else {
        context.setResponseContent(null);
      }
    }
  }
 else {
    transformWrite(contentToTransform,responseContent);
    context.setResponseContent(responseContent);
  }
}