adoptium.net VS valhalla-docs

1.18 requires Java 17. (Java link if you need it)

Note: In order for JarFix to work, you needed add all options when installing Java (Picture).

Did you actually install a Java Development Kit? Because this sounds like you only installed a text editor. You can download it here: https://adoptium.net/ (download the latest version for your OS and install it)

Try this https://adoptium.net/

Make sure you have Java fully installed (select all components when installing). Link to Java download if you need it: (Link)

if you downloaded Java from adoptopenjdk/adoptium/temurin/whatever they call it now, you do have it.

I had the same issue and I fixed it with downloading openjdk 17. you can download it here https://adoptium.net/

Which was recently rebranded as Eclipse Temurin

if they are using Windows, have them reinstall java https://adoptium.net/

e.g https://adoptium.net/

What isn't clear for me from https://github.com/openjdk/valhalla-docs/blob/main/site/design-notes/state-of-valhalla/02-object-model.md is whether or not value types will indeed be headerless.

Regarding type erasure, see https://github.com/openjdk/valhalla-docs/blob/main/site/design-notes/in-defense-of-erasure.md for a justification. Note in particular that not doing erasure would have forced languages like Scala to follow Java's semantics. In cases where erasure is actually a problem, you can work around it with classes like https://fasterxml.github.io/jackson-core/javadoc/2.2.0/com/fasterxml/jackson/core/type/TypeReference.html.

Here's a (relatively recent) post on type erasure from the lead of the value types project at Oracle https://github.com/openjdk/valhalla-docs/blob/main/site/design-notes/in-defense-of-erasure.md

If you want to read something a little more formal and fleshed out, try scanning through this document, and then come back again and tell me that Brian doesn't understand your suggestion.

Source

I haven't been following it incredibly closely, but I have checked in from time to time. It's a hard problem, but there's a lot of real progress (https://github.com/openjdk/valhalla-docs/blob/main/site/desi...).

I'd wager that it will ship by the next LTS, in 2024.

Quotes from here