Couple things to get this working.

1. Have a SFDC Developer or Enterprise Edition
2. Install Java (I used 1.7)
3. Install eClipse
4. Install Http Client (Used Apache)
   • http://hc.apache.org/downloads.cgi
   • 4.5
   • Uncompress in a folder
5. Install JSON framework
   • http://mvnrepository.com/artifact/org.json/json
   • Download 20140107 (You could try 20141113 with Java 8 if want to)
6. Created connected App in SFDC. Goto Setup -> Create -> Apps. Bottom of pag click New
   • Connected App Name = Test REST API
   • API Name = TEST_REST_API
   • Contact Email = Email
   • Click Enable OAuth Setting = True
   • Callback URL = https://localhost:8443/callback
   • Selected OAuth Scopes = Full Access(full)
   • Click SAVE
   • Click Continue
   • Note, You will need Consumer Key. Click Consumer Secret and note key also.
7. Clone Rep
8. Add External Jars to build path Connected App Name = Test REST API
   • httpclient-"version"
   • httpcore-"version"
   • commons-logging-"version"
   • commons-codec-"version"
   • json-20141113.jar

Have fun