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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