The App will start on local host. You should be able to access by http://localhost:8080/swagger-ui/index.html
start app locally
./gradlew bootRun
if you want to use composer/docker/ GraalVM you need to put the data Json file in a volume.
and see the environment variable
-Drental.data.path="volumeMount""
OR
RENTAL_DATA_PATH=VolumeMount