Springboot Hot Deployment

1.spring-boot-devtools for hot deployment

The most important feature of spring-boot-devtools is thermal deployment. It listens for file changes under Classpath and restarts the app immediately.

<dependency>    <groupId>org.springframework.boot</groupId>    <artifactId> Spring-boot-devtools</artifactid>    <optional>true</optional></dependency>

Optional=true means that dependencies are not passed, in other words, other projects that depend on the project, and if you want to use Devtools, you need to reintroduce

If you want to restart Spring boot when the file under the specified folder changes, we just need to configure the information in Src/main/resources/application.properties.

spring.devtools.restart.additional-paths= # Additional paths to watch for changes.

Custom Configuration Hot Deployment

The following configuration is used to customize the configuration of a hot deployment, and can not be set.

# Hot Deploy switch, false that does not enable hot deployment spring.devtools.restart.enabled:true# The specified hot deployment directory #spring.devtools.restart.additional-paths:src/ main/java# The specified directory is not updated spring.devtools.restart.exclude:test/**

If it is IntelliJ idea, you need to change the following two places:

1. Automatically compile on hook or manually recompile

File > Settings > Compiler-build Project automatically

2. Registration

CTRL + SHIFT + ALT +/> Registry > Tick compiler automake allow when app running

Precautions

1, production environment devtools will be disabled, such as Java-jar mode or a custom class loader, etc. will be recognized as a production environment.

2. The packaged app will not include Devtools by default unless you disable the properties of the Springboot maven plugin excludeDevtools .

3, thymeleaf no configuration spring.thymeleaf.cache:false , Devtools is automatically set by default, refer to the full properties.

https://github.com/spring-projects/spring-boot/blob/v1.5.7.RELEASE/spring-boot-devtools/src/main/java/org/ Springframework/boot/devtools/env/devtoolspropertydefaultspostprocessor.java

4, Devtools will occupy the Java process in Windows Explorer, in the development tool can not kill, only manually kill, or restart will be selected as the port repeated binding error.

2.Spring Loaded for thermal deployment

<plugin>    <groupId>org.springframework.boot</groupId>    <artifactId> spring-boot-maven-plugin</artifactid>    <dependencies>        <dependency>            <groupid >org.springframework</groupId>            <artifactId>springloaded</artifactId>            <version >1.2.6.RELEASE</version>        </dependency>    </dependencies></plugin>

Start the project with MVN Spring-boot:run.

Official Document: Https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-devtools.html

Springboot Hot Deployment