Github user olegz commented on a diff in the pull request: https://github.com/apache/nifi/pull/319#discussion_r59996122 --- Diff: nifi-nar-bundles/nifi-update-attribute-bundle/nifi-update-attribute-processor/src/main/java/org/apache/nifi/processors/attributes/UpdateAttribute.java --- @@ -489,17 +546,32 @@ private FlowFile executeActions(final ProcessSession session, final ProcessConte final Map<String, String> attributesToUpdate = new HashMap<>(actions.size()); final Set<String> attributesToDelete = new HashSet<>(actions.size()); + final Map<String, String> statefulAttributesToSet; + + if (statefulAttributes != null){ + statefulAttributesToSet = new HashMap<>(); + } else { + statefulAttributesToSet = null; + } + + // go through each action for (final Action action : actions.values()) { if (!action.getAttribute().equals(DELETE_ATTRIBUTES.getName())) { try { - final String newAttributeValue = getPropertyValue(action.getValue(), context).evaluateAttributeExpressions(flowfile).getValue(); + final String newAttributeValue = getPropertyValue(action.getValue(), context).evaluateAttributeExpressions(flowfile, statefulAttributes).getValue(); // log if appropriate if (logger.isDebugEnabled()) { logger.debug(String.format("%s setting attribute '%s' = '%s' for %s per rule '%s'.", this, action.getAttribute(), newAttributeValue, flowfile, ruleName)); } + if (statefulAttributesToSet != null) { + if(!action.getAttribute().equals("UpdateAttribute.matchedRule")) { --- End diff -- Same comment as above on NPE
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