How do I fix this dependency issue in Clojure? - clojure

Question

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?

Answer 1

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.