openjdk/jol
https://openjdk.org/projects/code-tools/jol observed · 2026-08-28
Health v2 · maintenance only
61/100
- Activity 63
- Release rhythm 35
- Longevity 100
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 2169
- days_rel: n/a
- days_push: 224
- n_releases_24m: 0
Adoption not part of the score
1088 stars · 110 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Java Object Layout (JOL) is a toolbox for analyzing object layout, memory footprint, and references inside JVMs. It uses Unsafe, JVMTI, and Serviceability Agent to decode actual object layouts more accurately than heap-dump-based tools.
Use cases
- analyze java object memory layout
- measure object memory footprint in jvm
- inspect field layout and padding of a class
- find duplicate strings in a heap dump
- estimate object sizes under compressed oops
- debug memory overhead of java data structures
When to choose
- you need precise JVM object layout and footprint data
- you are tuning memory usage of Java applications
- you want to understand object header and alignment behavior
When to avoid
- you need general heap profiling rather than layout analysis
- you work outside the JVM ecosystem
Facets
library · maturity active
developer-tools benchmarking monitoring developer-tools performance jvm cli object-layout memory-footprint jvm-internals heap-analysis serviceability-agent jvm memory-analysis
1 source
- readme: https://github.com/openjdk/jol · fetched 2026-08-28 · 6e2b92ddfb93
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| openjdk/jol | main | 61 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem