Collection of notes on Java 21
Virtual Threads: a performant alternative for io intensive applications for async frameworks. Not using an async framework tremendously simplifies your code. Code complexity has an enormous projection on everything else, especially when talking on the business level. First and foremost the cost of development and time to market rises. And then comes the cost of maintenance.
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You can use jlink to create a custom runtime you can distribute with your application, so that your users don't need to download a JRE/JDK. You'll still need to run this with the java command.
You can use also jpackage to create an executable file you can just double-click (.exe on Windows, whatever on mac and linux). -- via
A categorized list of all Java and JVM features since JDK 8 to 21 - Advanced Web Machinery