return_int.java

class JavaObjectThatReturnsInt {
  int getValue();
}

use_int.clj

(let [amap {1 (.getValue obj)}]
  (JavaObjectThatExpectsInt. amap))

use_int.java

class JavaObjectThatExpectsInt {
  public JavaObjectThatExpectsInt(Map<Integer, Integer> vals) {
     for(Integer key: vals.keySet()) {
       int val = vals.get(key); // classcast exception!
       // ...
     }
  }
}