Github user dbtsai commented on the issue: https://github.com/apache/spark/pull/21459 @rxin Mostly for Java 9+. [ASM 6.x](https://mvnrepository.com/artifact/org.ow2.asm/asm/6.0/usages) has been proven in many projects such as FB Presto, Google Guice Core Library, CGLIB, Gradle, and Jetty Servlet Annotations, naming a few. Since it's a self-contained change and has couple bug fixes, how about we lay a good foundation in Spark 2.4 now? If it causes any instability or performance regression, we can easily revert it given we still have some time for 2.4 release.
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