[GitHub] [spark] srowen commented on issue #24239: [SPARK-27121][REPL] Resolve Scala compiler failure for Java 9+ in REPL

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srowen commented on issue #24239: [SPARK-27121][REPL] Resolve Scala compiler failure for Java 9+ in REPL
URL: https://github.com/apache/spark/pull/24239#issuecomment-478031187
 
 
   I have been using Java 8 to compile, and Java 11 to test, yes. I set `JAVA_HOME` and change what `java` points to to switch. I am using Maven to compile and then run tests. Yeah you raise a good point, sometimes it thinks it needs to recompile, although I think in my case it will be using Java 8 anyway as `javac` always points to Java 8. 
   
   Yeah I'd want to be pretty sure that's valid before declaring everything working for Java 11, but it is letting me turn up Java 11-specific issues. That is, I don't expect that there's an issue that's hiding because somehow a class was compiled by Java 11, but it's possible. I expect the problems to be with the JDK classes and dependencies.
   
   I think we're going to call this support 'experimental' for 3.0 in any event as we may not ultimately resolve the Hive problems.

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