Many other OS libs are now running against org.apache.httpcomponents:httpclient:4.2.x (e.g. Selenium) which seems to be incompatible with org.apache.httpcomponents:httpclient:4.1 that aws-java-sdk depends on.

If I manually upgrade to org.apache.httpcomponents:httpclient:4.2.2 the AWS client throws java.lang.ClassNotFoundException: org.apache.http.HttpEntityEnclosingRequest during initialisation.

To work around this we're going to have to turn off Firefox auto-updates and pin FF at an old version so that Selenium works. Not really ideal for a web app dev team...