[GitHub] [spark] srowen opened a new pull request #24057: [SPARK-26839][WIP][SQL] Work around classloader changes in Java 9 for Hive isolation

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srowen opened a new pull request #24057: [SPARK-26839][WIP][SQL] Work around classloader changes in Java 9 for Hive isolation
URL: https://github.com/apache/spark/pull/24057
 
 
   (Don't merge this yet)
   
   ## What changes were proposed in this pull request?
   
   Java 9+ changed how ClassLoaders work. The two most salient points:
   - The boot classloader no longer 'sees' the platform classes. A new 'platform classloader' does and should be the parent of new ClassLoaders
   - The system classloader is no longer a URLClassLoader, so we can't get the URLs of JARs in its classpath
   
   ## How was this patch tested?
   
   We'll see whether Java 8 tests still pass here. Java 11 tests do not fully pass at this point; more notes below. This does make progress on the failures though.
   
   (NB: to test with Java 11, you need to build with Java 8 first, setting JAVA_HOME and java's executable correctly, then switch both to Java 11 for testing.)

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