[Spring Boot] How to Update Code and Take Effect Immediately

Problem
Assume I have a controller:

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package albert.controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class HelloController { @RequestMapping("/") public String sayHello(){ return "Hello! Spring Boot!"; } }

After I start up spring boot application, then connect to http://localhost:8080/.
The page  will look like:


If I would to change some wording in the sayHello() method, and I hope it takes effect immediately.
How to fulfill this requirement?

Solution
Add spring-boot-devtools dependency in pom.xml

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<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> </dependency>

Update application.yml, and set spring.devtools.restart.enabled=true

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spring: devtools: restart: enabled: true

When you set this property, immediately it takes effect and you need not manually stop and start the spring boot application.


Reference
[1] http://javabeat.net/spring-boot-devtools/