Library for listing version of Java class files. Collects the Java versions stored in class files and outputs it in various formats: text, CSV or summary (counts per version).

A Java class file has a well-defined format, consisting of a fixed-size header, a constant pool containing various constants used in the file, a set of fields and methods, and various attributes.

We’ve explored Java 22 and 23, and are finishing up with Java 24. Version 24 version introduces several new language features which collectively simplify code, and provide powerful tools for bytecode ...

JEP 457, Class-File API (Preview), has been Integrated into JDK 22, proposing a new API for parsing, generating, and transforming Java class files. This API will initially replace ASM within the ...

Java 24 adds several new features to the language, such as the availability of the Stream Gatherers API and Class-File API, ...

The Java Class File Disassembler ( javap ) is a useful tool for the Java developer that I have referenced in previous blog posts covering a variety of contexts such as detecting the innards of a ...

OpenJDK proposal would replace ASM with an up-to-date and performant API for parsing, generating, and transforming Java class files.

He has led software development projects to build enterprise-class software applications and has extensive experience with Java and Perl. He is the author of several Java books, including one called ...