View source for Spring Example with VS Code

=Introduction=
To make sure my Java is keeping up with my Typescript I revisited Spring to see what it would take to build a REST API using the Spring Web framework. The goal was
*Create a REST API
*Create GET endpoints
*Use a database in Spring
*Add Filtering to endpoint
*Add OAuth to endpoint
=Installation=
This was remarkably easy.
==Install Java==
<syntaxhighlight lang="bash">
sudo apt install default-jdk -y
</syntaxhighlight>
==Install Maven==
We grab lastest and put it in /opt
<syntaxhighlight lang="bash">
  wget https://dlcdn.apache.org/maven/maven-3/3.9.9/binaries/apache-maven-3.9.9-bin.tar.gz
  sudo tar xf apache-maven-3.9.9-bin.tar.gz -C /opt
</syntaxhighlight>
Make a profile in /etc/profile.d/maven.sh 
<syntaxhighlight lang="bash">
export JAVA_HOME=/usr/lib/jvm/default-java 
export M3_HOME=/opt/apache-maven-3.9.9
export MAVEN_HOME=/opt/apache-maven-3.9.9
export PATH=${M3_HOME}/bin:${PATH}
</syntaxhighlight>
Now we can have an environment with . /etc/profile.d/maven.sh
==VS Code Setup==
For me I installed
*Java Extension Pack
*Spring Boot Extension Pack
*Spring Initializer
==Create New Project==
You can do this using the Spring Initializer extension. For me the main change was to rename application.properties to application.yml so I could configure the project better. This included fixing the port and and the request header size
<syntaxhighlight lang="yaml">
spring:
  application:
    name: springbibble
server:
  port: 8082
  max-http-request-header-size: 10MB
</syntaxhighlight>
==Making an Endpoint==
This again could not be easier. All I had to do was in the Java Project explorer, press plus against my application and it prompted me to add a class. Type in pingController and we were away. Just add annotations to controller and endpoint
<syntaxhighlight lang="java">
@RestController
public class pingController {

    @GetMapping("/ping")
    public String ping() {
        return "pong";
    }
}
</syntaxhighlight>