# jdeferred/jdeferred

Java Deferred/Promise library similar to JQuery.

Repository: https://github.com/jdeferred/jdeferred
Canonical: https://ross.abutalabs.com/products/jdeferred
Language: Java
License: Apache-2.0
License Family: permissive
Topics: android, promise, java, async, promise-library
Last push: 2021-01-18T14:17:36+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4929, "days_push": 2053, "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 1494, forks 175 (observed 2026-08-28T04:04:52.918780+00:00)

## What it is
JDeferred is a Java Deferred/Promise library modeled after jQuery's Deferred object, supporting promise callbacks, multiple promise composition (when/race/settle), and generics-typed resolve/reject/notify. It works on the JVM and Android and is Java 8 lambda friendly.

## Use cases
- manage async callbacks in java without callback hell
- combine multiple async tasks with when/race/settle
- promise library for android development
- wrap runnable and callable tasks as promises
- report progress of long-running async operations

## When to choose
- you want jQuery-style deferred/promise semantics on the JVM or Android
- you need generics-typed promises with progress notifications
- you want to compose multiple async operations

## When to avoid
- you're on Java 8+ and can use CompletableFuture instead
- you need reactive streams like RxJava or Project Reactor
- you need a very actively maintained project - latest release is 2021

## Facets
- artifact type: library
- maturity: maintenance
- function: concurrency, developer-tools
- domain: developer-tools, cross-platform, mobile-development
- platform: jvm
- tags: promise, deferred, async, callbacks, java-8-lambdas, android

## Member repositories
- jdeferred/jdeferred (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:52.918780+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 2026-08-30T04:33:22.491523+00:00, confidence not recorded.
  - readme: https://github.com/jdeferred/jdeferred (fetched 2026-08-28T04:04:52.918780+00:00, sha 25af14fb4fd3)
- Data as of 2026-08-30T08:39:29.467469+00:00.