Devtools reload doesn't work with spring-boot-starter 1.4.2.RELEASE

[february]

hi
I am trying use STS to develop a simple spring boot application with spring-boot-starter 1.4.2.RELEASE.
after reading about the new dev tools introduction, i configured it in my project.
but it seems didn't work.
I found the issue#3315
perhaps it same as mine.
and then the Devtools reload worked vey well after i switched the spring-boot-starter to ver. 1.3.8.RELEASE.
why Devtools reload doesn't work with spring-boot-starter 1.4.2.RELEASE
any advice for me? thanks !!!

my pom file:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>example</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>example</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.4.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
                    <fork>true</fork>
                </configuration>
			</plugin>
		</plugins>
	</build>


</project>

[snicoll]

"It seems it does not work" is not really helping I am afraid. First of all if you are using STS you should start the application from STS rather than using the build plugin. If you want us to investigate, please explain what you've tried and why you believe it does not work.

[february]

hi @snicoll
thanks for your reply.
I recorded my operation to youtube.
I think it useful.

let me explain what i did.
first i create a simple spring boot project by STS.
and this video will show my project configuration about Devtools.
youtube video about project creation

and then, i added a rest controller class, and run it successfully.
youtube video about my simple controller

the last,i edit controller's source code,but i can't see any message about reload in console window.
of course,that is no change in the browser.
youtube video about didn't reload

i hope you can help me
thanks a lot!

[wilkinsona]

As far as I can tell, what you have shown should work. When you start your application as a Spring Boot App you should see some threads named restartedMain in the log output:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                        

2016-11-25 10:49:06.666  INFO 80773 --- [  restartedMain] s.devtools.SampleDevToolsApplication     : Starting SampleDevToolsApplication on aw-rmbp.home with PID 80773 (/Users/awilkinson/dev/spring/spring-boot/1.5.x/spring-boot-samples/spring-boot-sample-devtools/target/classes started by awilkinson in /Users/awilkinson/dev/spring/spring-boot/1.5.x/spring-boot-samples/spring-boot-sample-devtools)
2016-11-25 10:49:06.670  INFO 80773 --- [  restartedMain] s.devtools.SampleDevToolsApplication     : No active profile set, falling back to default profiles: default
2016-11-25 10:49:06.905  INFO 80773 --- [  restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4546ce7a: startup date [Fri Nov 25 10:49:06 GMT 2016]; root of context hierarchy
2016-11-25 10:49:07.930  INFO 80773 --- [  restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2016-11-25 10:49:07.939  INFO 80773 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service Tomcat
2016-11-25 10:49:07.940  INFO 80773 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.6

I wonder if the spring-boot-devtools jar got corrupted when Maven downloaded it. Can you try clearing out Maven's cache and rebuilding your app?

[february]

hi, @wilkinsona
you are right 👍 , it became work normally after clean out cache and rebuild the app.
but,we must take note of a detail of pom file :
the configure about devtools whitch generated by STS is lost the <optional>true</optional>
e.g.

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

as in my case, spring-boot-devtools can't work normally if pom file lost the <optional>true</optional> .
is it STS's issue?

however, thanks for your help!! 👍 ( to @wilkinsona @snicoll )

[february]

i think this is right way to config spring-boot-devtools

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<optional>true</optional>
			<scope>runtime</scope>
		</dependency>

is it ok?

[snicoll]

@february please use stackoverflow for questions. I am not aware of any problem with the runtime scope but it looks like it's an IDE configuration issue.

[february]

@snicoll sorry, i am foolish to make a mistake.
i think it is problem that the pom file lost the <optional>true</optional> ,
not the runtime scope.

[Arisono]

我已经解决了这个问题，中文的朋友请查阅 简书：https://www.jianshu.com/p/087668f20945