Binary milestone
Class File 61.0
Class file 61.0 is another important production anchor because Java 17 became the next major LTS platform and a major migration target.
61.0LTSSpring Boot 3+ era
All About Class File 61.0
Class File 61.0 • 2021 • Java 17
61.0LTSSpring Boot 3+ era
All About Class File 61.0
Class file 61.0 is another important production anchor because Java 17 became the next major LTS platform and a major migration target.
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 61Release context
What was happening around this milestone
LTS
Class file 61.0 is another important production anchor because Java 17 became the next major LTS platform and a major migration target.
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.