pvillard31 commented on a change in pull request #3879: NIFI-6856 - Support
MQTT consumer groups
URL: https://github.com/apache/nifi/pull/3879#discussion_r384613985
##########
File path:
nifi-nar-bundles/nifi-mqtt-bundle/nifi-mqtt-processors/src/main/java/org/apache/nifi/processors/mqtt/common/AbstractMQTTProcessor.java
##########
@@ -125,6 +126,7 @@ public ValidationResult validate(String subject, String
input, ValidationContext
.name("Client ID")
.description("MQTT client ID to use. If not set, a UUID will be
generated.")
.required(false)
+
.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
Review comment:
```suggestion
.expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY)
```
Since the evaluation is done in ``onScheduled``, there is no flow file
available and we're not using the attributes to make the expression language
evaluation. You can change the scope to use the Variable Registry.
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