frankyin-factual commented on pull request #29069:
URL: https://github.com/apache/spark/pull/29069#issuecomment-656954497


   I think the default one uses `ObjenesisInstantiator` which uses 
`StdInstantiatorStrategy` that goes pretty deep in vendor-specific JVM. I 
switched them to use `ConstructorInstantiator` which just uses plain java 
reflection to do object instantiation. If the mock `.class` generated has 
interface `MockAccess`,  this is certainly the safest route to construct such 
instance. 


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