How (in Java) do I create an Accumulator of type Long

[Steve Lewis]

     JavaSparkContext currentContext = ...;
        Accumulator<Integer> accumulator = currentContext.accumulator(0,
"MyAccumulator");

will create an Accumulator of Integers. For many large Data problems
Integer is too small and Long is a better type.
  I see a call like the following

      AccumulatorParam<Long> param = ?? how do I get one of these;
// no compiler is unhappy with this call
        Accumulator<Long> accumulatorLong = currentContext.accumulator(new
Long(0), acc ,param);

but NONE - ZERO documentation on its use, how to get a
 AccumulatorParam<Long> or how to turn one into an Accumulator.
   Any ideas