live url: https://springmvc-app-ranjit.herokuapp.com/user

Modules used in this demo app:-

java, springBoot, jpa, h2database/mysql, theamleaf

Required h2 config:-

#h2
spring.h2.console.enabled= true
spring.datasource.platform=h2
spring.h2.console.path=/h2
#datasource
spring.datasource.url= jdbc:h2:~/test
spring.datasource.username= sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver

Required mysql config:

# msql config
spring.datasource.url = jdbc:mysql://localhost:3306/springapp?useSSL=false
spring.datasource.username = root
spring.datasource.password = 
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.hibernate.ddl-auto = update
# msql config end	

Note: both h2database and mysql configration added it can be used as want by comment/uncomment each other, default config is h2database

theamleaf default config:-

#theamleaf
spring.thymeleaf.mode=HTML5
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html