Spring Documentation

It combines hand-written documentation written with Asciidoctor and auto-generated snippets produced with Spring MVC Test. This approach frees you from the limitations of the documentation produced by tools like Swagger.

Learn the Spring basics.Spring Boot builds on many other Spring projects.Check the spring.io web-site for a wealth of reference documentation.If you are starting out with Spring, try one of the guides.

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You can use Spring Boot in the same way as any standard Java library.To do so, include the appropriate spring-boot-*.jar files on your classpath.Spring Boot does not require any special tools integration, so you can use any IDE or text editor.Also, there is nothing special about a Spring Boot application, so you can run and debug a Spring Boot application as you would any other Java program.

Once downloaded, follow the INSTALL.txt instructions from the unpacked archive.In summary, there is a spring script (spring.bat for Windows) in a bin/ directory in the .zip file.Alternatively, you can use java -jar with the .jar file (the script helps you to be sure that the classpath is set correctly).

The Spring Boot CLI includes scripts that provide command completion for the BASH and zsh shells.You can source the script (also named spring) in any shell or put it in your personal or system-wide bash completion initialization.On a Debian system, the system-wide scripts are in /shell-completion/bash and all scripts in that directory are executed when a new shell starts.For example, to run the script manually if you have installed by using SDKMAN!, use the following commands:

You can shortcut the steps below by going to start.spring.io and choosing the "Web" starter from the dependencies searcher.Doing so generates a new project structure so that you can start coding right away.Check the start.spring.io user guide for more details.

The mvn dependency:tree command prints a tree representation of your project dependencies.You can see that spring-boot-starter-parent provides no dependencies by itself.To add the necessary dependencies, edit your pom.xml and add the spring-boot-starter-web dependency immediately below the parent section:

The gradle dependencies command prints a tree representation of your project dependencies.Right now, the project has no dependencies.To add the necessary dependencies, edit your build.gradle and add the spring-boot-starter-web dependency in the dependencies section:

At this point, your application should work.Since you used the spring-boot-starter-parent POM, you have a useful run goal that you can use to start the application.Type mvn spring-boot:run from the root project directory to start the application.You should see output similar to the following:

At this point, your application should work.Since you used the org.springframework.boot Gradle plugin, you have a useful bootRun goal that you can use to start the application.Type gradle bootRun from the root project directory to start the application.You should see output similar to the following:

The curated list contains all the Spring modules that you can use with Spring Boot as well as a refined list of third party libraries.The list is available as a standard Bills of Materials (spring-boot-dependencies) that can be used with both Maven and Gradle.

Starters are a set of convenient dependency descriptors that you can include in your application.You get a one-stop shop for all the Spring and related technologies that you need without having to hunt through sample code and copy-paste loads of dependency descriptors.For example, if you want to get started using Spring and JPA for database access, include the spring-boot-starter-data-jpa dependency in your project.

If the class is not on the classpath, you can use the excludeName attribute of the annotation and specify the fully qualified name instead.If you prefer to use @EnableAutoConfiguration rather than @SpringBootApplication, exclude and excludeName are also available.Finally, you can also control the list of auto-configuration classes to exclude by using the spring.autoconfigure.exclude property.

The Spring Boot Gradle plugin also includes a bootRun task that can be used to run your application in an exploded form.The bootRun task is added whenever you apply the org.springframework.boot and java plugins and is shown in the following example:

Spring Boot includes an additional set of tools that can make the application development experience a little more pleasant.The spring-boot-devtools module can be included in any project to provide additional development-time features.To include devtools support, add the module dependency to your build, as shown in the following listings for Maven and Gradle:

While caching is very beneficial in production, it can be counter-productive during development, preventing you from seeing the changes you just made in your application.For this reason, spring-boot-devtools disables the caching options by default.

Cache options are usually configured by settings in your application.properties file.For example, Thymeleaf offers the spring.thymeleaf.cache property.Rather than needing to set these properties manually, the spring-boot-devtools module automatically applies sensible development-time configuration.

Because you need more information about web requests while developing Spring MVC and Spring WebFlux applications, developer tools suggests you to enable DEBUG logging for the web logging group.This will give you information about the incoming request, which handler is processing it, the response outcome, and other details.If you wish to log all request details (including potentially sensitive information), you can turn on the spring.mvc.log-request-details or spring.codec.log-request-details configuration properties.

Applications that use spring-boot-devtools automatically restart whenever files on the classpath change.This can be a useful feature when working in an IDE, as it gives a very fast feedback loop for code changes.By default, any entry on the classpath that points to a directory is monitored for changes.Note that certain resources, such as static assets and view templates, do not need to restart the application.

Certain resources do not necessarily need to trigger a restart when they are changed.For example, Thymeleaf templates can be edited in-place.By default, changing resources in /META-INF/maven, /META-INF/resources, /resources, /static, /public, or /templates does not trigger a restart but does trigger a live reload.If you want to customize these exclusions, you can use the spring.devtools.restart.exclude property.For example, to exclude only /static and /public you would set the following property:

You may want your application to be restarted or reloaded when you make changes to files that are not on the classpath.To do so, use the spring.devtools.restart.additional-paths property to configure additional paths to watch for changes.You can use the spring.devtools.restart.exclude property described earlier to control whether changes beneath the additional paths trigger a full restart or a live reload.

If you do not want to use the restart feature, you can disable it by using the spring.devtools.restart.enabled property.In most cases, you can set this property in your application.properties (doing so still initializes the restart classloader, but it does not watch for file changes).

The spring-boot-devtools module includes an embedded LiveReload server that can be used to trigger a browser refresh when a resource is changed.LiveReload browser extensions are freely available for Chrome, Firefox and Safari.You can find these extensions by searching 'LiveReload' in the marketplace or store of your chosen browser.

Any properties added to these files apply to all Spring Boot applications on your machine that use devtools.For example, to configure restart to always use a trigger file, you would add the following property to your spring-boot-devtools file:

Any profiles activated in .spring-boot-devtools.properties will not affect the loading of profile-specific configuration files.Profile specific filenames (of the form spring-boot-devtools-.properties) and spring.config.activate.on-profile documents in both YAML and Properties files are not supported.

FileSystemWatcher works by polling the class changes with a certain time interval, and then waiting for a predefined quiet period to make sure there are no more changes.Since Spring Boot relies entirely on the IDE to compile and copy files into the location from where Spring Boot can read them, you might find that there are times when certain changes are not reflected when devtools restarts the application.If you observe such problems constantly, try increasing the spring.devtools.restart.poll-interval and spring.devtools.restart.quiet-period parameters to the values that fit your development environment:

Remote devtools support is provided in two parts: a server-side endpoint that accepts connections and a client application that you run in your IDE.The server component is automatically enabled when the spring.devtools.remote.secret property is set.The client component must be launched manually.

This is typically manifested by a warning in the RemoteSpringApplication logs about failing to upload some of the classes, and a consequent retry.But it may also lead to application code inconsistency and failure to restart after the first batch of changes is uploaded.If you observe such problems constantly, try increasing the spring.devtools.restart.poll-interval and spring.devtools.restart.quiet-period parameters to the values that fit your development environment.See the Configuring File System Watcher section for configuring these properties.

If no failure analyzers are able to handle the exception, you can still display the full conditions report to better understand what went wrong.To do so, you need to enable the debug property or enable DEBUG logging for org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener. 2351a5e196