Kubernetes deployment object throws the 405 errors - spring-boot

Question

I try to make Kubernetes test cluster with Minikube on Windows 10. I use my Spring Boot image which contains Tomcat middleware and Thymeleaf. First I make Pod manifest:
apiVersion: v1
kind: Pod
metadata:
name: app-boot
labels:
deploy: boot-app
spec:
containers:
- name: boot-app
image: app:latest # This image is generated by local docker machine and it works successfully. It contains tomcat and thymeleaf
imagePullPolicy: Never
ports:
- containerPort: 8080
args: ["-t", "-i"]
---
apiVersion: v1
kind: Service
metadata:
name: app-boot-svc
spec:
selector:
deploy: boot-app
ports:
- port: 8080
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: test-ingress
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /
spec:
rules:
- host: boot.aaa.com
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: app-boot-svc
port:
number: 8080
The above Kubernetes manifest works successfully without errors. Then I change the Pod object to Deployment like below,
apiVersion: apps/v1
kind: Deployment
metadata:
name: boot-deploy
spec:
replicas: 2
selector:
matchLabels:
deploy: boot-app
template:
metadata:
labels:
deploy: boot-app
spec:
containers:
- name: boot-app
image: app:latest
imagePullPolicy: Never
ports:
- containerPort: 8080
args: ["-t", "-i"]
But the ingress hostname throws the errors,
[nio-8080-exec-4] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported]
The Spring Boot codes which bring out this issue has only http get method only.
#GetMapping("/list")
public void list(#ModelAttribute("pageVO") PageVO vo, Model model) {
....
....
However when I use my Spring Boot Pod objects, the ingress hosts throws no errors. In the case of using Deployment objects, the web browser throws the following errors.
There was an unexpected error (type=Method Not Allowed, status=405)
Is there another option which configure the default web method of Kubernetes pod, service or ingress? If there is, I want to know how to set the default web method of ingress host.
Update
I set the replicas number of Deployment object to 1, Then no errors are thrown from Minikube. And below codes are the Service codes.
apiVersion: v1
kind: Service
metadata:
name: app-boot-svc
spec:
selector:
deploy: boot-app
ports:
- port: 8080
I am afraid my service object codes would contain some errors. Any idea?