# EsotericSoftware/reflectasm

High performance Java reflection

Repository: https://github.com/EsotericSoftware/reflectasm
Canonical: https://ross.abutalabs.com/products/reflectasm
Language: Java
License: BSD-3-Clause
License Family: permissive
Last push: 2025-06-05T00:35:07+00:00

## Health v2 (maintenance only)
Score: 34/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 25, release rhythm 8, longevity 100
- inputs: {"age_days": 4683, "days_push": 455, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1539, forks 218 (observed 2026-08-28T04:05:00.337024+00:00)

## What it is
ReflectASM is a small Java library providing high-performance reflection through bytecode code generation. It generates accessor classes for fields, methods, and constructors that are much faster than standard Java reflection.

## Use cases
- call methods faster than java reflection
- get and set fields without boxing overhead
- create new instances via generated bytecode accessors
- speed up serialization frameworks
- avoid reflection overhead in hot loops

## When to choose
- you need reflective access to Java classes with maximum performance
- you are building serialization or mapping libraries on the JVM
- repeated method/field access is a profiling bottleneck

## When to avoid
- you only need occasional reflection where performance is irrelevant
- you need reflection on non-JVM languages
- bytecode generation is restricted in your runtime environment

## Facets
- artifact type: library
- maturity: stable
- function: serialization, developer-tools
- domain: performance, developer-tools, programming-languages
- platform: jvm
- tags: reflection, bytecode-generation, java

## Member repositories
- EsotericSoftware/reflectasm (main) score 34

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:00.337024+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 2026-08-30T04:30:52.657980+00:00, confidence not recorded.
  - readme: https://github.com/EsotericSoftware/reflectasm (fetched 2026-08-28T04:05:00.337024+00:00, sha e89b7c529431)
- Data as of 2026-08-30T08:39:29.467469+00:00.