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Class File 65.0 favicon All About Class File 65.0
Class File 65.0 • 2023 • Java 21
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65.0LTSVirtual threads

All About Class File 65.0

Class file 65.0 sits at a highly important modern milestone: Java 21 and the arrival of virtual threads in the LTS line.

Binary milestone

Class File 65.0

Class file 65.0 sits at a highly important modern milestone: Java 21 and the arrival of virtual threads in the LTS line.

65.0LTSVirtual threads
Compatibility meaning

Why the version number matters

The class file version is the binary compatibility signal that tells tooling and runtimes which generation of compiled Java bytecode they are dealing with.

This class file milestone aligns with an LTS anchor, so it matters both for binary compatibility and for long-term operational baselines.

javap -verbose MyClass.class
# look for: major version 65
Release context

What was happening around this milestone

LTS, virtual threads

Class file 65.0 sits at a highly important modern milestone: Java 21 and the arrival of virtual threads in the LTS line.

Related pages

Continue through binary and runtime history

Common Class File Return to the class file timeline and compare this version with adjacent milestones. Common Java See the source-language side of the Java release associated with this class file version. Common JLS Compare source-language specification changes with binary-format evolution. Common JDK Use the platform view when you want to connect bytecode changes to tooling and runtime packaging.