[classlib][luni] On RI, constructor of EnumMap -- EnumMap(Class keyType) throws unspecified NullPointerException

[Spark Shen]

Hi All:
Constructor of EnumMap -- EnumMap(Class<K> keyType) behaves a little odd:
I first synthesis an enum type with class body as below:
enum color {
       blue{},
       red{},
}

Then constructs java.util.EnumMap(Class<K>) using this Enum type:

import java.util.EnumMap;


public class ConstructEnumMap {
   enum color {
       blue{},
       red{},
   }
  
   enum fruit {
       apple,
   }
 
   @SuppressWarnings("unchecked")
   public static void main(String[] args) {
       new EnumMap(fruit.apple.getClass());
       *new EnumMap(color.blue.getClass());*
   }

}

NullPointerException will be thrown out from the bolded line. While 
using enum type without a class body, no such exception
will be thrown out. This behavior is unspecified on spec. IMO, this is a 
bug of RI.

What is your opinion about this behavior?

Best regards

--
Spark Shen
China Software Development Lab, IBM


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