squito commented on issue #23804: [WIP][SPARK-26896] JDK 11 module adjustments 
for running tests
URL: https://github.com/apache/spark/pull/23804#issuecomment-465300670
 
 
   yeah I didn't understand it either.  The stack trace really didn't make 
sense to me, but I found putting in the `add-opens` rule made it go away.  
Later on in my jdk 11 experiments, I discovered that somehow maven / surefire 
were doing some funny class-loading which was obscuring stack traces -- I was 
able to get a full and meaningful traces by directly invoking junit.  I should 
probably try that again on the failures that I hit
   
   (sorry this has only partial attention from me at the moment -- like I said, 
just wanted to post for discussion as I'm sure others are experimenting with 
jdk11 ...)

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