dan-s1 commented on code in PR #11850:
URL: https://github.com/apache/nifi/pull/11850#discussion_r4425828613


##########
nifi-extension-bundles/nifi-jslt-bundle/nifi-jslt-processors/src/main/java/org/apache/nifi/processors/jslt/JSLTTransformJSON.java:
##########
@@ -476,14 +476,20 @@ private FlowFile transformJsonLines(final Expression 
jsltExpression, final FlowF
             try (final BufferedReader reader = new BufferedReader(new 
InputStreamReader(inputStream, StandardCharsets.UTF_8));
                  final JsonGenerator jsonGenerator = 
writer.createGenerator(outputStream)) {
                 String line;
+                int lines = 0;
                 while ((line = reader.readLine()) != null) {
+                    lines++;
                     if (line.isBlank()) {
                         continue;
                     }
 
                     final JsonNode jsonNode = 
JSON_OBJECT_MAPPER.readTree(line);
                     final JsonNode transformedJson = 
jsltExpression.apply(jsonNode);
-                    jsonGenerator.writeObject(transformedJson);
+                    if (transformedJson == null || transformedJson.isNull()) {
+                        getLogger().debug("JSLT Transform resulted in no data 
on line {}", lines + 1);

Review Comment:
   I am not sure why. Isn't it easier for readers of the log message to 
understand 1 based and not 0 based?



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