This example is old, incredibly old if you look at the dates. It has not kept up with the developments in Spring Data Aerospike and the auto-configuration project aerospike-community/spring-boot-data-aerospike.
No worries, here is a modern example of Spring Boot using Aerospike and the associated February 2021 blog post Simple Web Application Using Java, Spring Boot, Aerospike and Docker.
Aerospike example application built using Spring Boot and Spring Data for Aerospike. It is associated with the January 2016 blog post Spring Data for Aerospike.
This is the application built from the Spring Boot Tutorial on this repo's wiki.
The example expects an Aerospike DB to be running at localhost:3000. To configure this edit the configuration class.