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The following call:
(String/format "%s" "a")
… throws a “ClassCastException java.lang.String cannot be cast to [Ljava.lang.Object” exception in Clojure.
(String/format "%s" (cast Object "a"))
…. produces the same exception.
Because last argument in java API is array
Object[]instead ofObject.Just call
(String/format "%s" (into-array ["a"]))But more idiomatic to use
(format "Hello %s" "world")