Java 20 - From ThreadLocal to ScopedValue with Loom Full Tutorial - JEP Café #16

ThreadLocal variables can help you share sensitive information among the different components of an application, without resorting to method calls. They have drawbacks that are now fixed with ScopedValue variables. Understand how ScopedValue are working and how you can use them as an incubator feature in JDK 20. ⎯⎯⎯⎯⎯⎯ Chapters ⎯⎯⎯⎯⎯⎯ 0:00 Intro 1:09 Why have ThreadLocal variables been introduced? 2:44 How does ThreadLocal variables work? 4:57 ThreadLocal variables drawbacks: leaking and memory footprint 7:39 How Virtual Threads are changing the need for ThreadLocal 10:10 Introducing the new requirements for ScopedValue 11:02 Creating and using a ScopedValue 13:09 Reading a ScopeValue and dealing with errors 14:17 What is the scope of a ScopedValue? 16:59 Setting several ScopedValue for a task, rebinding a ScopedValue 17:55 Final words and outro ⎯⎯⎯⎯⎯⎯ Resources ⎯⎯⎯⎯⎯⎯ ◦ Project Loom ➱ https://openjdk.org/projects/loom/ ◦ Project Loom mailing list ➱ https://mail.openjdk.org/mailman/listinfo/loom-dev ◦ Scoped Values (Incubator) ➱ https://openjdk.org/jeps/429 ◦ Virtual Threads (2nd Preview) ➱ https://openjdk.org/jeps/436 ◦ Structured Concurrency (2nd Incubator) ➱ https://openjdk.org/jeps/437 ◦ JEP Café 12 on Virtual Threads ➱ https://youtu.be/UVoGE0GZZPI ◦ JEP Café 13 on Structured Concurrency ➱ https://youtu.be/2nOj8MKHvmw ◦ Dev.java ➱ https://dev.java ◦ Inside.java ➱ https://inside.java ◦ JDK 20 ➱ https://openjdk.org/projects/jdk/20 ◦ OpenJDK ➱ https://openjdk.org ◦ Oracle Java ➱ https://www.oracle.com/java/ Tags: #Java #Java17 #Java20 #OpenJDK #JDK #JDK17 #Loom #VritualThreads #JEPCafe #insidejava