# doocs/jvm

🤗 JVM 底层原理最全知识总结

Repository: https://github.com/doocs/jvm
Canonical: https://ross.abutalabs.com/products/jvm
Homepage: http://jvm.doocs.org
Language: TypeScript
License: CC-BY-SA-4.0
License Family: other
Topics: jvm, java, hotspot, memory-allocation, class, gc, doocs
Last push: 2026-08-24T12:45:08+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 2994, "days_push": 9, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 11120, forks 2299 (observed 2026-08-28T04:10:46.150881+00:00)

## What it is
A curated knowledge summary of Java Virtual Machine internals maintained by the Doocs community, covering memory structure, HotSpot object layout, garbage collection, performance tuning, and class loading. It is published as a documentation website (jvm.doocs.org) with an offline PDF option.

## Use cases
- learn how JVM memory structure works
- understand garbage collection algorithms and HotSpot collectors
- prepare for Java backend interviews on JVM internals
- study class loading process and parent delegation model
- tune JVM performance for large-memory deployments
- understand class file structure and bytecode format

## When to choose
- you want a concise, well-organized summary of key JVM concepts in Chinese
- you are preparing for Java interviews covering memory, GC, and class loading
- you need a free reference to complement 'Understanding the JVM' by Zhou Zhiming

## When to avoid
- you need exhaustive, book-depth coverage of JVM internals
- you need English-language material
- you need hands-on tooling or code rather than conceptual notes

## Facets
- artifact type: learning-resource
- maturity: active
- function: documentation
- domain: tutorials, programming-languages, developer-tools
- platform: -
- tags: jvm, java, hotspot, garbage-collection, class-loading, memory-management, interview-prep, chinese, web-server

## Member repositories
- doocs/jvm (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:46.150881+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 2026-08-29T17:16:46.986779+00:00, confidence not recorded.
  - readme: https://github.com/doocs/jvm (fetched 2026-08-28T04:10:46.150881+00:00, sha 26473647960a)
  - homepage: http://jvm.doocs.org (fetched 2026-08-29T08:15:44.581368+00:00, sha b54bf3af03ce)
  - site_page: https://jvm.doocs.org/00-quickstart (fetched 2026-08-29T08:15:44.590529+00:00, sha 6b00949d3dd8)
- Data as of 2026-08-30T08:39:29.467469+00:00.