Gain insights into Spring Boot, delve into auto-configuration, database integration, and web services, and learn to build a functional "Elite Club" web application.

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Spring Boot Billionaire Club

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In this course, you will cover the most important aspects of Spring Boot including auto-configuration, database integration, and webservices.

Throughout this course, you will build a fully functional application called the “Elite Club” which any browser can connect to. The initial version of the application will expose one rest endpoint to return the hardcoded list of elite clubs. The subsequent chapter will be improving the application by adding new features.

By the end of this course, you will be well equipped to build enterprise and web applications.

Building Enterprise Applications with Spring Boot

# Executable JAR for easy deployment
In the past, when monolithic application development was standard practice in the industry, the deployment of Java applications was a complex affair. The application had to be deployed in heavy application containers like Websphere, Weblogic, etc.

To make an application work, we had to:
1. Install and configure the application server
2. Install a database driver
3. Create a database connection
4. Create a connection pool
5. Build and test our application
6. Deploy our application and its dependency on the application server (WAR or EAR).

**Spring Boot** has collapsed all the above steps into just a few. How?

Spring Boot generates a self-executable **fat JAR** where all the dependencies are packaged inside the JAR (including the container). 

>We don’t deploy the Spring Boot application to the application container or the web container.


To verify it, let's unzip the generated fat JAR and navigate to the `BOOT-INF/lib directory. We will find two JAR,s `tomcat-embed-core` and `tomcat-embed-websocket`.

## Advantage of fat JAR
What’s so special about having a packaged container? The answer is on-demand scalability. We can scale up or scale down the application to any number of instances whenever needed.

We could never do that with the conventional approach! 


## How a fat JAR is generated
Spring Boot Maven plugin ensures that all dependencies are zipped into an output JAR, including the container. All this is taken care of by one Maven plugin.



```
<plugin>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
```
>Generated spring boot JAR is called **Fat JAR or Uber JAR**.

Once you have the fat JAR, it can be run on any system where  Java virtual machine is available using the below command:

```
Java  –jar <SpringBootAppName.jar> 
```


Learn how an executable jar generated by Spring Boot enables designing an application that scales easily.

Introduction

Getting Started With Spring Boot

Auto-Configuration In Depth

Database Integration

Expose Rest Webservice

Consuming Rest Webservice

Bonus

Final Words

Self Executable JAR

Executable JAR for easy deployment