Github user steveloughran commented on the pull request: https://github.com/apache/spark/pull/9221#issuecomment-150151459 Looking @ the twitter4j poms, their dependencies pull in a com.googlecode.kryo -given the kryo pain its a possible troublespot. However, that com.googlecode release is so old its in a different package from the com.esotericsoftware-packaged releases Various modules seems to refer to a different junit (3.8.2 in http-2, 4.10 in core, ...), but those are test scoped only. Log4j 1.2.17; SLF4J 1.7.12, commons-logging 1.1 -nothing incompatible with the spark versions, afaik. main [pom.xml](https://github.com/yusuke/twitter4j/blob/master/twitter4j-core/pom.xml)
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