[SOLVED] How do I fix this dependency issue in Clojure?

How do I fix this dependency issue in Clojure?

I'm having a lot of trouble fixing an issue where the dependencies for two different packages are colliding. My project.clj's dependencies look like this:

  :dependencies [[org.clojure/clojure "1.6.0"]
                 [itsy "0.1.1"]  
                 [amazonica "0.3.22" :exclusions [commons-logging org.apache.httpcomponents/httpclient com.fasterxml.jackson.core/jackson-core]]])

My namespace looks like this:

(ns crawler.core
  (:require [itsy.core :refer :all])
  (:require [itsy.extract :refer :all])
  (:use  [amazonica.core]
         [amazonica.aws.s3]))

When I try to load the namespace into lein's repl with (load crawler/core), I get this error:

CompilerException java.lang.NoSuchMethodError: com.fasterxml.jackson.core.JsonFactory.requiresPropertyOrdering()Z, compiling:(amazonica/core.clj:1:1)

Online sources suggest that this is a dependency mismatch. How do I fix it?

Solution

I put the exclusion on itsy rather than amazonica and it worked. Also fixed the NS form in core.clj.

project.clj:

(defproject blabla "0.1.0-SNAPSHOT"
   :description "FIXME: write description"
  :url "http://example.com/FIXME"
   :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :dependencies [[org.clojure/clojure "1.6.0"]
                 [itsy "0.1.1" :exclusions [com.fasterxml.jackson.core/jackson-core]]  
                  [amazonica "0.3.22" :exclusions [commons-logging org.apache.httpcomponents/httpclient]]])

core.clj:

(ns blabla.core
  (:require [itsy.core :refer :all]
            [itsy.extract :refer :all]
            [amazonica.core :refer :all]
            [amazonica.aws.s3 :refer :all]))

(defn foo
   "I don't do a whole lot."
  [x]
   (println x "Hello, World!"))

to deal with these situatuions in general run

lein deps :tree

and add exclusions until only the newest versions remain.