# ingokegel/jclasslib

jclasslib bytecode editor is a tool that visualizes all aspects of compiled Java class files and the contained bytecode.

Repository: https://github.com/ingokegel/jclasslib
Canonical: https://ross.abutalabs.com/products/jclasslib
Language: Kotlin
License: NOASSERTION
License Family: other
Topics: kotlin, java, bytecode, gui
Last push: 2026-08-08T17:31:31+00:00

## Health v2 (maintenance only)
Score: 80/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 96, release rhythm 48, longevity 100
- inputs: {"age_days": 5404, "days_push": 25, "days_rel": 132, "gap_med": 233.5, "n_releases_24m": 3}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2995, forks 424 (observed 2026-08-28T04:07:36.796187+00:00)

## What it is
jclasslib is a desktop GUI tool that visualizes and edits compiled Java class files and their bytecode, including constant pool entries and instructions. It also ships a Kotlin Multiplatform library for programmatically reading and writing JVM class files.

## Use cases
- inspect java bytecode of compiled class files
- edit constant pool entries in a class file
- view bytecode of a kotlin or groovy file inside intellij
- read and write java class files programmatically
- understand what the compiler generated for my java code

## When to choose
- you need a visual, interactive viewer and editor for JVM class files and bytecode
- you want an IntelliJ IDEA plugin to inspect bytecode of the open file
- you need a library to parse or generate Java class files from Kotlin, Java, or JS

## When to avoid
- you need a decompiler that produces readable Java source code
- you only need quick javap-style output in the terminal without a GUI
- your project cannot accept GPL-licensed dependencies

## Facets
- artifact type: application
- maturity: active
- function: gui, developer-tools, parser, editor
- domain: developer-tools
- platform: cross-platform, jvm
- tags: bytecode-viewer, bytecode-editor, java-class-files, jvm, intellij-plugin, kotlin-multiplatform, java, kotlin, bytecode, desktop

## Member repositories
- ingokegel/jclasslib (main) score 80

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:36.796187+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:30:45.644994+00:00, confidence not recorded.
  - readme: https://github.com/ingokegel/jclasslib (fetched 2026-08-28T04:07:36.796187+00:00, sha 82fe443f43d0)
- Data as of 2026-08-30T08:39:29.467469+00:00.