Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/961
@trkurc
it just came to my mind that the pom.xml change should be safe to commit.
The change is just pushing into the build phase a setting that is already
present when nifi is executed:
```
$ grep awt bootstrap.conf
java.arg.14=-Djava.awt.headless=true
```
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