GCP App Engine部署Spring Boot应用出现404错误求助

使用Maven命令clean package appengine:deploy -P cloud-gcp将基于MySQL+Hibernate的Spring Boot应用构建并部署到GCP App Engine后，访问URL https://murali-401512.uc.r.appspot.com/MA/ 时出现404错误。以下是应用所用的配置文件：

配置文件详情 #

app.yaml #

runtime: java11
env_variables:
SPRING_PROFILES_ACTIVE: "gcp,mysql"
handlers:
- url: /.*
  script: this field is required, but ignored
manual_scaling:
instances: 1

spring-cloud-bootstrap.properties #

spring.cloud.appId=murali-401522

application-gcp.properties #

spring.cloud.gcp.sql.instance-connection-name=murali-401522:us-central1:myappdb
spring.cloud.gcp.sql.database-name=myappdb

application.properties #

spring.application.name=
server.servlet.context-path=/MA
server.port=8080

spring.mvc.view.prefix= /WEB-INF/jsp/
spring.mvc.view.suffix= .jsp
logging.level.org.springframework.boot.autoconfigure=DEBUG
spring.main.lazy-initialization=true
server.servlet.session.timeout=60s
server.servlet.session.cookie.max-age=60s

#Spring Security
spring.security.user.name=murali
spring.security.user.password=murali

spring.datasource.url=jdbc:mysql:///quickstart-db?cloudSqlInstance=murali-401522:us-central1:myappdb&socketFactory=com.google.cloud.sql.mysql.SocketFactory&user=quickstart-user&password=&useSSL=false
spring.jpa.hibernate.ddl-auto=update
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect
spring.jpa.show-sql=true
#spring.data.jpa.repositories.bootstrap-mode=default

#Sending Email
spring.mail.host=smtp.gmail.com
spring.mail.port=587
spring.mail.username=muralidharan2973x@gmail.com
spring.mail.password=nazcwlrsezmppwws
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true

#Adding this property since it is enabled by default
spring.cloud.gcp.sql.enabled=false

内容的提问来源于stack exchange，提问作者Muralidharan G