Simple application that interfaces with CircleBack's web api to merge existing contacts

• Change api.key property in src/main/resources/application.properties to your api key
• If you don't wish to use the api then setting input.test.response.enabled=true will emulate api interaction using the file configured by input.test.response.file
• ./gradlew run

./gradlew build

./gradlew test

• java 8
• gradle
• apache commons configuration (https://commons.apache.org/proper/commons-configuration/)
• guice (https://github.com/google/guice/wiki)
• retrofit (http://square.github.io/retrofit/)
• testng

Short answer is because dependency injection makes life a whole lot easier, and Spring is overkill for the scope of this application. More information on Guice vs Spring can be found here: https://github.com/google/guice/wiki/SpringComparison