When I first started exploring Virtual Threads in Java, I wanted to understand everything about them like, performance characteristics, when they yield, and limitations. This journey led me to an interesting challenge about file I/O operations. These operations cause Virtual Threads to become “pinned” to platform threads, limiting their effectiveness for I/O-heavy applications.
This pinning issue has been widely acknowledged across the Java community. It's mentioned in the Virtual Threads JEP, discussed on Reddit threads, debated on mailing lists, and highlighted in the “State of Loom".