AWS, Docker, ECR, ECS and Spring Boot weekend fun (Part 1)

It's a lovely, foggy Saturday. Perfect time to start digging into AWS.  

I figured I would try and get a demo/Hello World Spring Boot App running inside a Docker Container, push the Docker Image up to ECR and try and get it running in Amazon Fargate and blog my experience.

1. Amazon Corretto.  I have a slightly-outdated version of Amazon's OpenJDK 17 running on my home Dev machine.

c:\>java -version
openjdk version "17.0.1" 2021-10-19 LTS
OpenJDK Runtime Environment Corretto-17.0.1.12.1 (build 17.0.1+12-LTS)
OpenJDK 64-Bit Server VM Corretto-17.0.1.12.1 (build 17.0.1+12-LTS, mixed mode, sharing)

I guess I could run on this, but decided to get the latest.  cURL command to get the latest AmazonCorretto JDK for Windows:

curl -LO https://corretto.aws/downloads/latest/amazon-corretto-17-x64-windows-jdk.zip

At home I run WSL2 on my Windows Dev machine.  I have a MacBook Pro also and jump between the 2 of them for personal development.

(don't forget to run a checksum to make sure the file was not tampered with, this actually saved me once)

I then manually went to https://corretto.aws/downloads/latest_sha256/amazon-corretto-17-x64-windows-jdk.zip and verified that the SHA-256 checksum is the same:

a89555d3a482f67bfdb9fe07b906592e9763e047e435f811c34b72bebd4200b3

After unzipping and setting up JAVA_HOME and Windows Path:

c:\>java -version
openjdk version "17.0.5" 2022-10-18 LTS
OpenJDK Runtime Environment Corretto-17.0.5.8.1 (build 17.0.5+8-LTS)
OpenJDK 64-Bit Server VM Corretto-17.0.5.8.1 (build 17.0.5+8-LTS, mixed mode, sharing)

2. Spring Initializr + IntelliJ

I bought a JetBrains All Products Pack earlier this week (previously had been using IntelliJ CE + VS Code for Java + Angular personal development).

IntelliJ Ultimate Edition has great support for Spring Initializr.

Here I am creating a new Spring Boot JAR project, specifying the Amazon Corretto JDK 17 that I just installed.

And selecting Spring Boot Starters (Spring Web, Spring Boot Actuator).

3. Since my goal this weekend is to study and learn about various aspects of AWS, I just need a quick and dirty Spring Boot App that exposes a REST endpoint.

I went to https://spring.io/guides/gs/actuator-service/ and copied over the HelloWorldController and Greeting model, ran it locally through IntelliJ and verified I could hit the REST endpoint on port 8080.

4. Confirmed I could run through IDE and hit the REST endpoint.

Also built the Spring Boot JAR and confirmed I could run that and hit the REST endpoint:

PS C:\work\spring-boot-aws\demo> ./mvnw package  
PS C:\work\spring-boot-aws\demo> java -jar .\target\demo-0.0.1-SNAPSHOT.jar