Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1225#issuecomment-145529038
The JavaDoc can be built using
```
mvn javadoc:aggregate -Pdocs-and-source -DadditionalJOption="-Xdoclint:none"
```
The `-Xdoclint:none` is still required because of stricter checking of
JavaDoc in Java 8.
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