Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/2980
Thanks for discovering this @thenatog . This is an excellent catch.
I've added behavior to catch this, better documentation, and unit tests.
However, I added them on the branch that includes [PR
2983](https://github.com/apache/nifi/pull/2983). Let's mark this PR as closed
and just review the other one, as it is more complete and addresses this issue.
```
2018-09-07 21:21:19,784 WARN [Timer-Driven Process Thread-6]
o.a.n.security.util.crypto.HashService The charset provided was UTF-16, but
Java will insert a Big Endian BOM in the decoded message before hashing, so
switching to UTF-16BE
2018-09-07 21:21:19,797 INFO [Timer-Driven Process Thread-9]
o.a.n.processors.standard.LogAttribute
LogAttribute[id=b15f3209-344d-10a6-4a7b-454530bb72fc] logging for flow file
StandardFlowFileRecord[uuid=a4a223fb-aa11-43b9-93a3-d7675c44593c,claim=StandardContentClaim
[resourceClaim=StandardResourceClaim[id=1536378604366-1, container=default,
section=1], offset=56, length=4],offset=0,name=33467912436349,size=4]
--------------------[SUCCESS] --------------------
Standard FlowFile Attributes
Key: 'entryDate'
Value: 'Fri Sep 07 21:21:19 PDT 2018'
Key: 'lineageStartDate'
Value: 'Fri Sep 07 21:21:19 PDT 2018'
Key: 'fileSize'
Value: '4'
FlowFile Attribute Map Content
Key: 'filename'
Value: '33467912436349'
Key: 'path'
Value: './'
Key: 'test_attribute'
Value: 'hehe'
Key: 'test_attribute_md5_utf16le'
Value: '2db0ecc27f7abd29ba95412feb3b5e07'
Key: 'uuid'
Value: 'a4a223fb-aa11-43b9-93a3-d7675c44593c'
--------------------[SUCCESS] --------------------
hehe
2018-09-07 21:21:19,799 INFO [Timer-Driven Process Thread-9]
o.a.n.processors.standard.LogAttribute
LogAttribute[id=b15f3209-344d-10a6-4a7b-454530bb72fc] logging for flow file
StandardFlowFileRecord[uuid=b7459e40-500b-488d-a0dc-3e09ebc6b86e,claim=StandardContentClaim
[resourceClaim=StandardResourceClaim[id=1536378604366-1, container=default,
section=1], offset=56, length=4],offset=0,name=33467912436349,size=4]
--------------------[SUCCESS] --------------------
Standard FlowFile Attributes
Key: 'entryDate'
Value: 'Fri Sep 07 21:21:19 PDT 2018'
Key: 'lineageStartDate'
Value: 'Fri Sep 07 21:21:19 PDT 2018'
Key: 'fileSize'
Value: '4'
FlowFile Attribute Map Content
Key: 'filename'
Value: '33467912436349'
Key: 'path'
Value: './'
Key: 'test_attribute'
Value: 'hehe'
Key: 'test_attribute_md5_utf16'
Value: 'b0ed26b524e0b0606551d78e42b5b7bc'
Key: 'uuid'
Value: 'b7459e40-500b-488d-a0dc-3e09ebc6b86e'
--------------------[SUCCESS] --------------------
hehe
2018-09-07 21:21:19,801 INFO [Timer-Driven Process Thread-9]
o.a.n.processors.standard.LogAttribute
LogAttribute[id=b15f3209-344d-10a6-4a7b-454530bb72fc] logging for flow file
StandardFlowFileRecord[uuid=25c5d1b1-faa4-418d-911c-5c0cea399b83,claim=StandardContentClaim
[resourceClaim=StandardResourceClaim[id=1536378604366-1, container=default,
section=1], offset=56, length=4],offset=0,name=33467912436349,size=4]
--------------------[SUCCESS] --------------------
Standard FlowFile Attributes
Key: 'entryDate'
Value: 'Fri Sep 07 21:21:19 PDT 2018'
Key: 'lineageStartDate'
Value: 'Fri Sep 07 21:21:19 PDT 2018'
Key: 'fileSize'
Value: '4'
FlowFile Attribute Map Content
Key: 'filename'
Value: '33467912436349'
Key: 'path'
Value: './'
Key: 'test_attribute'
Value: 'hehe'
Key: 'test_attribute_md5_utf16be'
Value: 'b0ed26b524e0b0606551d78e42b5b7bc'
Key: 'uuid'
Value: '25c5d1b1-faa4-418d-911c-5c0cea399b83'
--------------------[SUCCESS] --------------------
hehe
```
---
