Spring WebFlux example application: notice board

[Lomanu4]

Objective


I wrote this application to explain the mechanism of different components of the Spring framework.

Function

• Display notice on stated time
• Approval before display
• Multi language UI

Main component used

• Project Reactor 3.7.X
• Spring Boot 3.4.X
• Spring WebFlux 6.2.X with thymeleaf 3.1.X
• Spring Security 6.4.X
• Spring R2DBC 6.2.X
• Dozer 7.0.X
• netty 4.1.X

Database


By default, data is stored in an embedded H2 database. Schema and data is imported when the application starts and all data will be lost after application shutdown.

MySQL database is also supported. In order to switch to MySQL database, first to modify the following properties located in application.properties file.


spring.r2dbc.url=r2dbc:mysql://localhost:3306/database-name
spring.r2dbc.username=root
spring.r2dbc.password=password

Then deactivate 'db-h2' and activate 'db-mysql' Maven profiles when starting the application. And activate 'init-db' profiles also when starting the application at the first time.

Prerequisite

• Java SE Development Kit 17 or above
• Internet connection

Compile and run


Apache Maven wrapper is included, no additional package manager is necessary.

Compile (On Microsoft Windows)


mvnw package
Run (On Microsoft Windows)


mvnw spring-boot:run

Press Ctrl+C to stop.

Maven profiles

ID	Activated by default	Function
db-h2		Using embedded H2 database
db-mysql	No	Using MySQL database
init-db		Import schema and initial data into database

Account

Username	Password	Authorities
user1	user1	USER
user2	user2	USER
admin	admin	USER, ADMIN

Source code


You may download source code from

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