Github user dragos commented on the pull request:
https://github.com/apache/spark/pull/9282#issuecomment-152180069
The serializer is delegating to the context class loader for instantiating
classes it receives on the wire. When this class loader is missing (`null`),
the JVM looks up the class in the *primordial* classloader, which usually
contains only the JDK classes.
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