Christian Woerz
Java 21: The Revolution of Virtual Threads - A Deep Dive
#1about 6 minutes
Building a traditional blocking web application
A live coding demonstration shows how to build a standard blocking API with Spring Boot and how its performance degrades under load.
#2about 5 minutes
Understanding the limitations of platform threads
Creating thousands of traditional platform threads demonstrates their high memory consumption, 1:1 mapping to OS threads, and eventual OutOfMemoryError.
#3about 12 minutes
Improving performance with a reactive approach
Refactoring the blocking API to use asynchronous programming with CompletableFuture solves the performance bottleneck but introduces significant code complexity.
#4about 7 minutes
How virtual threads solve the concurrency problem
Virtual threads are lightweight, JVM-managed threads that run on a small pool of carrier threads, enabling millions of concurrent tasks without high memory overhead.
#5about 4 minutes
Enabling virtual threads in a Spring Boot application
A single configuration flag in Spring Boot 3.2 is all that's needed to switch the application to use virtual threads for handling requests.
#6about 8 minutes
Managing parallel tasks with structured concurrency
StructuredTaskScope provides a modern API to run multiple blocking operations concurrently in separate virtual threads, simplifying parallel code.
#7about 4 minutes
Understanding the limitations of virtual threads
Virtual threads can be "pinned" to their carrier thread by synchronized blocks, native calls, or CPU-intensive tasks, which negates their benefits.
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