Substitute for groupingReduce ?

Michael Nascimento misterm at
Wed Mar 20 12:49:26 PDT 2013

On Wed, Mar 20, 2013 at 4:36 PM, Brian Goetz <brian.goetz at> wrote:
> I think you're missing a reduce function in that call?  I see a classifying
> function and a merge function.

This compiled with b76. I am migrating a code base that was running
with a previous JDK.

So there is no substitute that assumes the returned value is a unique
index and throws an Exception if it is not? This is what
Maps.uniqueIndex does:,

and what the groupingReduce variant did with the throwingMerger. I
still didn't quite understand how to rewrite this...


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