Upgrade to Java 21

[jorgeazevedo]

What does this change?

Upgrades Java runtime from 11 to 21.

This code relies on using java.net.URL constructors new URL() which has been deprecated in Java 20.

This constructor is used to to be able to call Source.fromUrl on a classpath:/ URL. This was done by instantiating a new URL object on classpath:/ directly, which the URL constructor does not support, so it required writing a custom UrlStreamHandler to load it from the file system.

Before patch

Source.fromURL(
  new URL(null, classPathLocation.toString, classpathHandler), 
  // toString() => "classpath:/test-data.json"
  "utf-8"
 )

The alternative proposed here is to just call getClass.getResource(path) and get a natively supported file:/ URL object

After patch

val resourceURL = Option(getClass.getResource(path)).getOrElse {
  throw new FileNotFoundException(s"$path not found on classpath")
}
Source.fromURL(
  resourceURL, 
  // toString() "file:/~/code/guardian/prism/target/scala-2.13/classes/test-data.json"
  "utf-8") 

How has this change been tested?

Beyond the local execution, I've deployed it to CODE and as far as I can tell the application is running properly and able to populate the different endpoints.

[github-actions]

Deploy build 1793 of devx::prism to CODE

All deployment options

• Deploy build 1793 of devx::prism to CODE
• Deploy parts of build 1793 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.