Github user jkbradley commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3157#discussion_r21924054
  
    --- Diff: core/src/test/java/org/apache/spark/JavaAPISuite.java ---
    @@ -1556,7 +1558,7 @@ public void testGuavaOptional() {
       @Test
       public void testRegisterKryoClasses() {
         SparkConf conf = new SparkConf();
    -    conf.registerKryoClasses(new Class[]{ Class1.class, Class2.class });
    +    conf.registerKryoClasses(new Class<?>[]{ Class1.class, Class2.class });
    --- End diff --
    
    That warning does not show up for me.  Do you need some higher-than-default 
warning setting turned on for it?  (The fix does seem fine; I'm just wondering.)


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