Github user jskora commented on a diff in the pull request: https://github.com/apache/nifi/pull/1988#discussion_r125982805 --- Diff: nifi-mock/src/main/java/org/apache/nifi/util/MockProcessSession.java --- @@ -756,6 +756,13 @@ public void transfer(FlowFile flowFile) { throw new IllegalArgumentException("I only accept MockFlowFile"); } + // if the flowfile provided was created in this session (i.e. it's in currentVersions), + // then throw an exception indicating that you can't transfer flowfiles back to self. + // this mimics the behavior of StandardProcessSession + if(currentVersions.get(flowFile.getId()) != null) { --- End diff -- This should only fire the exception if the `flowFile.getId()` is in `currentVersions` but not in `originalVersions` since those are the newly created FlowFiles. If it's in both it's a queued file being transferred back to the queue. You can see the problem if you run the `TestUpdateAttribute` tests.
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