Spring Boot 2.1.5

[Tony Phan]

Thisguide provides a sampling of how Spring Boot helps you accelerate application development. As you read more Spring Getting Started guides, you will see more use cases for Spring Boot. This guide is meant to give you a quick taste of Spring Boot. If you want to create your own Spring Boot-based project, visit Spring Initializr, fill in your project details, pick your options, and download a bundled up project as a zip file.

Like most Spring Getting Started guides, you can start from scratch and complete each step or you can bypass basic setup steps that are already familiar to you. Either way, you end up with working code.

Spring Boot offers a fast way to build applications. It looks at your classpath and at the beans you have configured, makes reasonable assumptions about what you are missing, and adds those items. With Spring Boot, you can focus more on business features and less on infrastructure.

Is Spring MVC on the classpath? There are several specific beans you almost always need, and Spring Boot adds them automatically. A Spring MVC application also needs a servlet container, so Spring Boot automatically configures embedded Tomcat.

These are just a few examples of the automatic configuration Spring Boot provides. At the same time, Spring Boot does not get in your way. For example, if Thymeleaf is on your path, Spring Boot automatically adds a SpringTemplateEngine to your application context. But if you define your own SpringTemplateEngine with your own settings, Spring Boot does not add one. This leaves you in control with little effort on your part.

The class is flagged as a @RestController, meaning it is ready for use by Spring MVC to handle web requests. @GetMapping maps / to the index() method. When invoked from a browser or by using curl on the command line, the method returns pure text. That is because @RestController combines @Controller and @ResponseBody, two annotations that results in web requests returning data rather than a view.

The Spring Initializr creates a simple application class for you. However, in this case, it is too simple. You need to modify the application class to match the following listing (from src/main/java/com/example/springboot/Application.java):

@EnableAutoConfiguration: Tells Spring Boot to start adding beans based on classpath settings, other beans, and various property settings. For example, if spring-webmvc is on the classpath, this annotation flags the application as a web application and activates key behaviors, such as setting up a DispatcherServlet.

There is also a CommandLineRunner method marked as a @Bean, and this runs on start up. It retrieves all the beans that were created by your application or that were automatically added by Spring Boot. It sorts them and prints them out.

MockMvc comes from Spring Test and lets you, through a set of convenient builder classes, send HTTP requests into the DispatcherServlet and make assertions about the result. Note the use of @AutoConfigureMockMvc and @SpringBootTest to inject a MockMvc instance. Having used @SpringBootTest, we are asking for the whole application context to be created. An alternative would be to ask Spring Boot to create only the web layers of the context by using @WebMvcTest. In either case, Spring Boot automatically tries to locate the main application class of your application, but you can override it or narrow it down if you want to build something different.

As well as mocking the HTTP request cycle, you can also use Spring Boot to write a simple full-stack integration test. For example, instead of (or as well as) the mock test shown earlier, we could create the following test (from src/test/java/com/example/springboot/HelloControllerITest.java):

The embedded server starts on a random port because of webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, and the actual port is configured automatically in the base URL for the TestRestTemplate.

If you are building a web site for your business, you probably need to add some management services. Spring Boot provides several such services (such as health, audits, beans, and more) with its actuator module.

Spring Boot is an open source Java-based framework used to create a micro Service. It is developed by Pivotal Team and is used to build stand-alone and production ready spring applications. This chapter will give you an introduction to Spring Boot and familiarizes you with its basic concepts.

Micro Service is an architecture that allows the developers to develop and deploy services independently. Each service running has its own process and this achieves the lightweight model to support business applications.

Spring Boot provides a good platform for Java developers to develop a stand-alone and production-grade spring application that you can just run. You can get started with minimum configurations without the need for an entire Spring configuration setup.

Spring Boot automatically configures your application based on the dependencies you have added to the project by using @EnableAutoConfiguration annotation. For example, if MySQL database is on your classpath, but you have not configured any database connection, then Spring Boot auto-configures an in-memory database.

Spring Boot Auto Configuration automatically configures your Spring application based on the JAR dependencies you added in the project. For example, if MySQL database is on your class path, but you have not configured any database connection, then Spring Boot auto configures an in-memory database.

The entry point of the Spring Boot Application is the class contains @SpringBootApplication annotation. This class should have the main method to run the Spring Boot application. @SpringBootApplication annotation includes Auto- Configuration, Component Scan, and Spring Boot Configuration.

Spring Boot application scans all the beans and package declarations when the application initializes. You need to add the @ComponentScan annotation for your class file to scan your components added in your project.

The Spring Boot Dashboard extension provides an explorer in the side bar where you can view all of a workspace's spring boot projects conveniently in one place. You can also quickly start, stop or debug a project.

Spring Boot is an open-source Java framework used for programming standalone, production-grade Spring-based applications with minimal effort.[3] Spring Boot is a convention-over-configuration extension for the Spring Java platform intended to help minimize configuration concerns while creating Spring-based applications.[4][5] Most of the application can be preconfigured using Spring team's "opinionated view"[6][7] of the best configuration and use of the Spring platform and third-party libraries.

Spring Boot has a class SpringBootServletInitializer, which is a specialization of the WebApplicationInitializer.[16] This SpringBootServletInitializer is an out-of-the-box implementation of WebApplicationInitializer, which eliminates the need for the developer to construct their own implementation of the WebApplicationInitializer class.[16]

The configuration properties for the Spring Boot application can be specified in the application.properties or application.yml file.[16]Examples of properties that can be included in this file include the server.port and spring.application.name properties.[16]

Spring boot has an annotation, @SpringBootApplication, which allows the Spring Boot application to autoconfigure third-party libraries and detected features found on the classpath.[16] As an example, the class that has the @SpringBootApplication annotation can extend the SpringBootServerInitializer class if the application is packaged and deployed as a WAR file.[16]

The @SpringBootConfiguration annotation is a specialization of the Spring-specific @Configuration annotation.[17] The class with the @SpringBootConfiguration is marked as the configuration class for the Spring Boot application.[17]

The Spring Boot Actuator allows for monitoring and management capabilities for the Spring Boot Application.[18] A major advantage of using the Spring Boot Actuator is that it implements a number of production-ready features without requiring the developer to construct their own implementations.[18]

Spring Boot has integration with the Spring Security Module. The simplest way for integrating Spring Boot with Spring Security is to declare the starter dependency in the build configuration file.[20]

The shared secret is not a part of the app descriptor but is data that is shared using the lifecycle events. These events are send to your app when an admin (un)installs your app on there Jira Cloud instance.

See also the docs on this Multitenancy in Connect

Hello;

I know that the shared secret is not part of the app descriptor. What I meant is that as soon as I install the plugin, I do not get the shared secret, which is important in the management of JWT.

This is the response from the Chrome Network Response after the installation process

Not sure how you are using the Chrome Network Response in the installation flow, but to my knowledge the lifecycle events are only shared with your app using the lifecycle endpoints configured in the app descriptor. They are never shared with the user that managing the app.

You may also want to look at the app logs for the package com.atlassian.connect.spring.internal.lifecycle This is where the LifecycleController lives and it does log when it received install and uninstall events.

If you change this from none/missing to jwt that you need to uninstall & reinstall the app so that your app will get the new lifecycle event body which should include the shared secret in the event body.

Note for Kubernetes users - If you intend to run your Spring Boot-based applications in Kubernetes, we recommend following an alternative to the Spring Boot plugin solution. CyberArk offers a Kubernetes-native 'Push To File' feature, described in Secrets Provider - init container/sidecar - Push-to-File mode.

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