clojure is a lisp, so it has a "real" eval, that works on
datastructures, not strings

eg.

(eval '(+ 1 2)) ; => 3
(eval (list (symbol "+") 1 2)) ; => 3

whenever you write someting like (def x 3), it gets turned into a list
with the symbol 'def, the symbol 'x and the number 3, which then is
passed to eval.

but regarding your question:
you should replace all those cases where you concatenate strings with
syntax-quote:

(def import-list '(java.util.HashMap java.util.Map))
`(import ~...@import-list) ; => (clojure.core/import java.util.HashMap
java.util.Map)

those backticks create "templates" for code/datastructures, where you
can insert stuff, for specifics http://clojure.org/reader
which  (the part about syntax-quote)

you can eval these lists then

Alex

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