Ingress for SpringBoot service
As mentioned by @slintes, did you add an IngressController ? You can add one (nginx ingress controller) easily with the command :
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/cloud/deploy.yamlBy the way in your question you're saying that you have a spring boot app on port 30123 but your ingress points to the 31922 port. Is it normal ?
Hope it helps.