Github user bbende commented on the issue: https://github.com/apache/nifi/pull/1148 Thank you for contributing. In addition to adding the expressionLanguageSupported flag on the property descriptors, we would also need to go through the code and find every place where the properties are evaluated, for example: https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-hadoop-bundle/nifi-hdfs-processors/src/main/java/org/apache/nifi/processors/hadoop/AbstractHadoopProcessor.java#L283 And that would need to call evaluateAttributeExpressions().
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