This is kind of an interesting case. From poking at it a bit, the {} is
typed as a IPersistentMap, and IPM does NOT extend java.util.Map (although
the implementations like PersistentArrayMap and PersistentHashMap do via
APersistentMap).
I think the interesting question is why the type hint is not taking effect
as you would expect that to work. That could be because {} is a constant
empty map. That needs some more investigation and if you wanted to file a
jira ticket, we could do so further.
One workaround to get you going for now is:
(let [builder (DateTimeFormatterBuilder.)]
(.appendText builder ChronoField/YEAR ^java.util.Map (array-map)))
On Monday, May 16, 2016 at 7:15:35 AM UTC-5, 676c7...@gmail.com wrote:
>
> Hello,
>
> I am getting a reflection warning in Java interop and don’t understand
> why:
>
> (import 'java.time.format.DateTimeFormatterBuilder
> 'java.time.temporal.ChronoField)
>
> (set! *warn-on-reflection* true)
>
> (let [builder (DateTimeFormatterBuilder.)]
> (.appendText builder ChronoField/YEAR {}))
> ; Reflection warning, ... - call to method appendText on
> java.time.format.DateTimeFormatterBuilder can't be resolved (argument
> types: java.time.temporal.ChronoField, clojure.lang.IPersistentMap).
>
> The method expects a java.util.Map, which {} implements, so this should
> resolve without problem. I have tried adding a type hint but it has no
> effect:
>
> (let [builder (DateTimeFormatterBuilder.)]
> (.appendText builder ChronoField/YEAR ^java.util.Map {}))
>
> What is the best way to type-hint this properly?
>
> Thank you,
>
>
> --
> David
>
>
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