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Improve Virtual Threads section to mention the changes in Java 24 #46547

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Improve Virtual Threads section to mention the changes in Java 24 #46547

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update Virtual Threads docs
zakaria-shahen Jul 25, 2025
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Reword Pinned Virtual Threads note
zakaria-shahen Jul 29, 2025
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zakaria-shahen Jul 29, 2025
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2 changes: 2 additions & 0 deletions ...t-docs/src/docs/antora/modules/reference/pages/features/spring-application.adoc
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Expand Up @@ -405,6 +405,8 @@ If you're running on Java 21 or up, you can enable virtual threads by setting th
Before turning on this option for your application, you should consider https://docs.oracle.com/en/java/javase/21/core/virtual-threads.html[reading the official Java virtual threads documentation].
In some cases, applications can experience lower throughput because of "Pinned Virtual Threads"; this page also explains how to detect such cases with JDK Flight Recorder or the `jcmd` CLI.

When utilizing virtual threads, we advise upgrading to Java 24 or later. According to https://openjdk.org/jeps/491[JEP 491], Java 24 allows synchronizing virtual threads without pinning; however, pinned virtual threads still occurs when a native method or a foreign function is called on.

NOTE: If virtual threads are enabled, properties which configure thread pools don't have an effect anymore.
That's because virtual threads are scheduled on a JVM wide platform thread pool and not on dedicated thread pools.

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