You should quote the binding vector:
(let [v '[D (LocalDate/of 2017 03 30)]
f '(.getYear D)]
(eval `(let ~v ~f)))
2017-03-30 16:04 GMT+08:00 'Burt' via Clojure <clojure@googlegroups.com>:
> Hi,
>
> I want to pass Java objects to a piece of code via let and then get it
> evaluated with eval.
>
> An minimal example:
>
> (ns eval
> (:import (java.time LocalDate)))
>
> (let [v ['S (String. "ab")]
> f '(.length S)]
> (eval `(let ~v ~f)))
>
> ; => 2
>
> (let [v ['D (LocalDate/of 2017 03 30)]
> f '(.getYear D)]
> (eval `(let ~v ~f))))
>
> ; => CompilerException java.lang.RuntimeException: Can't embed object in
> code, maybe print-dup not defined: 2017-03-30
>
>
> The first example with String works fine and is what I want to do.
>
>
> But if I transfer the example to other Java classes, for example LocalDate I
> get an error, see the second example.
>
>
> Can anybody help?
>
>
> Kind regards,
>
> Burt
>
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