Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/2685#issuecomment-61052076
Another thing to notice is that Kryo 2.21 is a really weird release. [Kryo
2.21
POM](https://repo1.maven.org/maven2/com/esotericsoftware/kryo/kryo/2.21/kryo-2.21.pom)
suggests that Objenesis classes are relocated to package
`com.esotericsoftware.shaded.org.objenesis`, but classes within the Maven
artifact jar file still reside in package `org.objenesis`. Also, Kryo GitHub
repo doesn't provide 2.21 release download and the version number in the POM of
[kryo-2.21
tag](https://github.com/EsotericSoftware/kryo/blob/kryo-2.21/pom.xml#L13) is
actually `2.21-SNAPSHOT`.
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