Now that you’ve learned about Spring and Spring Boot, let’s jump into the Initializr lab to bootstrap our new Spring Boot project with all our intial dependencies. When you finish, you can check your results against the code in gs-spring-boot/complete. Like most Spring Getting Started guides, you can start from scratch and complete each https://remotemode.net/become-a-java-developer-se-9/spring-boot/ step or you can bypass basic setup steps that are already familiar to you. Spring Boot allows us to externalize our configuration so that we can work with the same application in different environments. The application uses YAML files to externalize configuration. To create a Spring Boot application, following are the prerequisites.
Now, let’s get hands-on, learning how to set up a required Spring MVC infrastructure with Spring Boot, and how to expose Controllers as endpoints mapped to web application URLs. Next, you’ll learn how to create a Spring MVC application using Spring Boot. Next, let’s learn the basics of Spring Boot, and how to get started quickly. We can now check if the number of reservations in the requested time exceeds the capacity and reject the reservation request if it does.
Spring Boot – A Closer Look
We’ll take the concepts you’ve learned in this module, and apply them to your Spring Application. We’ll learn how properties are loaded, how to use auto-configuration to simplify your application initialization, and how easy it is to override the default configuration. Next, let’s learn how to package your Spring Boot application, and how easy it is to apply integration testing to your Spring Boot apps.
We have the Reservation class but we have not created a way to specify which type of amenity is getting reserved (the pool, sauna, or gym). Let’s first create a user by sending a POST request to UserController. We will do that by clicking the last box (the green one) under user-controller list. Controllers will handle the requests that are passed to this controller by the request handler and return the corresponding views, in this case. Each model class corresponds to a database table with the same name and the fields in the model class will be columns in the corresponding table.
We need to store those somehow and also check that there is enough capacity before we approve a reservation. We also need a BCryptPasswordEncoder bean to satisfy that dependency in WebSecurityConfig and to make it work. Let’s modify our main class to add a bean and change the constructor parameters to give our predefined User a username. Then we add the new Reservation to the user’s list of reservations and update the user to reflect these changes.
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- We also need to create a controller that will return us this view so we can see it in the browser.
- We are grabbing the UserDetails object which stores the info related to user.
- If you are building a web site for your business, you probably need to add some management services.
We then redirect the user to the reservations page to show the updated reservations list. The fields of the reservation object should be all set by the form. We are updating our reservations controller to move the user object to the session because we want that to be accessible from another controller method and not only from a template.
List of Features for the App
In this demo you’ll see how to create a Spring Boot application with ease. If the current number of overlapping reservations is equal to the capacity, it means that the next one will exceed it so we throw the exception. We are grabbing the UserDetails object which stores the info related to user.
It provides an easier and faster way to set up, configure, and run both simple and web-based applications. Next, we’ll learn how Spring Boot Actuator can help give you insights into a running Spring Boot Application, and how to access every endpoint that Actuator offers. Learn how metrics and monitoring through health indicators helps the application gain visibility. Now, let’s learn about how to protect methods in your Spring Application with method level security. Let’s learn how to map requests for HTTP POST, and DELETE methods in a Spring Boot REST application. In this demo you’ll see how to set up a required Spring MVC infrastructure with Spring Boot, and how to expose Controllers as endpoints mapped to web application URLs.
After you are done, run your application again to insert the initial data and connect to H2 console as we learned before to confirm that our date is indeed inserted. If you do not have any errors, you should be able to see that the user and the reservation are inserted successfully. Notice how we used the builder pattern to create the reservation object easily.
- Now, we’ll learn about Web Controllers and Message Converters, needed to build a Web App in Spring Boot.
- Spring Boot provides several such services (such as health, audits, beans, and more) with its actuator module.
- Next, let’s start to learn about Actuator Health Indicators, where you’ll create your own Health Indicator, and expose the current status of your application.
We will also create the controllers that will return these views. Notice the annotation @Entity on top of our model classes. This annotation is handled by Hibernate and whenever Hibernate sees @Entity, it will create a table using the name of our class as table name. I believe it is a more convenient tool for API development than it is for MVC apps since it generates REST API code by default. But it will still make our lives easier even with a Spring Boot MVC application that contains views.