Resilience4j website screenshot

Resilience4j

Resilience4j is a lightweight fault tolerance library designed for Java 17+ and functional programming, providing higher-order functions to enhance functional interfaces with Circuit Breaker, Rate Limiter, Retry, Bulkhead, TimeLimiter, and Cache patterns. Designed as a replacement for Netflix Hystrix, it integrates with Spring Boot 2 and 3, Micronaut, RxJava, Spring Reactor, Micrometer, Prometheus, and Dropwizard Metrics. Used in production by Deutsche Telekom (400M+ requests/day), PlayStation Network, AOL, and Auto Trader Group.

Resilience4j publishes 1 API on the APIs.io network. Tagged areas include Bulkhead, Circuit Breaker, Fault Tolerance, Java, and Microservices.

The Resilience4j catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Resilience4j’s developer surface includes documentation, getting-started guide, GitHub presence, release notes, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
38.8/100 thin ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemium
1 APIs
BulkheadCircuit BreakerFault ToleranceJavaMicroservicesRate LimiterResilienceRetrySpring BootFunctional Programming

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 38.8/100 · thin
Contract Quality 7.3 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 6.8 / 13
Governance 7.0 / 12
Discoverability 5.9 / 10
Agent readiness — 3/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/resilience4j: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Resilience4j

Resilience4j is a lightweight fault tolerance library for Java 17+ using functional programming patterns. It provides six core resilience patterns: Circuit Breaker (prevents cas...

Pricing Plans 1

Published pricing tiers and plan structures.

Resilience4J Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Resilience4J Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Resilience4J Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Resilience4J Context

26 classes · 0 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Resilience4j API Rules

6 rules · 4 warnings 2 info

SPECTRAL

JSON Schema 5

Standalone JSON Schema definitions for this provider's data models.

Resilience4j Bulkhead Configuration

1 properties

JSON SCHEMA

Resilience4j Circuit Breaker Configuration

1 properties

JSON SCHEMA

Resilience4j Rate Limiter Configuration

1 properties

JSON SCHEMA

Resilience4j Retry Configuration

1 properties

JSON SCHEMA

Resilience4j Time Limiter Configuration

1 properties

JSON SCHEMA

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

Resilience4J Circuit Breaker Structure

0 properties

JSON STRUCTURE

Resilience4J Retry Structure

0 properties

JSON STRUCTURE

Examples 1

Example request and response payloads for these APIs.

Resilience4J Circuit Breaker Config Example

5 fields

EXAMPLE

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Resilience4J Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted
 SpringDemo
SpringDemo

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Build 2

SDKs, sample code, and the tooling you integrate with

GitHub
GitHub
 GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ReleaseNotes
ReleaseNotes
 Issues
Issues

Commercial 1

Pricing, plans, and the legal terms of use

License
License

Company 1

The organization behind the API

Website
Website

Other 3

Properties that don't map to a standard resource type

MavenCentral
MavenCentral
 SpringBoot
SpringBoot
 Micronaut
Micronaut

Source (apis.yml)

apis.yml Raw ↑ 
aid: resilience4j
name: Resilience4j
description: Resilience4j is a lightweight fault tolerance library designed for Java 17+ and functional programming, providing
  higher-order functions to enhance functional interfaces with Circuit Breaker, Rate Limiter, Retry, Bulkhead, TimeLimiter,
  and Cache patterns. Designed as a replacement for Netflix Hystrix, it integrates with Spring Boot 2 and 3, Micronaut, RxJava,
  Spring Reactor, Micrometer, Prometheus, and Dropwizard Metrics. Used in production by Deutsche Telekom (400M+ requests/day),
  PlayStation Network, AOL, and Auto Trader Group.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/resilience4j.png
tags:
- Bulkhead
- Circuit Breaker
- Fault Tolerance
- Java
- Microservices
- Rate Limiter
- Resilience
- Retry
- Spring Boot
- Functional Programming
url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-05-02'
specificationVersion: '0.19'
apis:
- aid: resilience4j:resilience4j
  name: Resilience4j
  description: 'Resilience4j is a lightweight fault tolerance library for Java 17+ using functional programming patterns.
    It provides six core resilience patterns: Circuit Breaker (prevents cascading failures), Rate Limiter (controls throughput),
    Bulkhead (isolates resources), Retry (automatic retries with backoff), TimeLimiter (timeout handling), and Cache (result
    caching). Spring Boot Actuator integration exposes management endpoints for monitoring circuit breaker state, events,
    and metrics.'
  humanURL: https://resilience4j.readme.io/
  tags:
  - Bulkhead
  - Circuit Breaker
  - Fault Tolerance
  - Java
  - Microservices
  - Rate Limiter
  - Resilience
  - Retry
  - Spring Boot
  - Functional Programming
  properties:
  - type: Documentation
    url: https://resilience4j.readme.io/docs
  - type: GettingStarted
    url: https://resilience4j.readme.io/docs/getting-started
  - type: GitHub
    url: https://github.com/resilience4j/resilience4j
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/json-schema/circuit-breaker-configuration.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/json-schema/retry-configuration.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/json-schema/rate-limiter-configuration.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/json-schema/bulkhead-configuration.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/json-schema/time-limiter-configuration.json
  - type: JSONStructure
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/json-structure/resilience4j-circuit-breaker-structure.json
  - type: JSONStructure
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/json-structure/resilience4j-retry-structure.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/json-ld/resilience4j-context.jsonld
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/resilience4j/refs/heads/main/vocabulary/resilience4j-vocabulary.yml
common:
- type: DomainSecurity
  url: security/resilience4j-domain-security.yml
- type: Website
  url: https://resilience4j.readme.io/
- type: Documentation
  url: https://resilience4j.readme.io/docs
- type: GettingStarted
  url: https://resilience4j.readme.io/docs/getting-started
- type: GitHub
  url: https://github.com/resilience4j/resilience4j
- type: GitHubOrganization
  url: https://github.com/resilience4j
- type: ReleaseNotes
  url: https://github.com/resilience4j/resilience4j/releases
- type: Issues
  url: https://github.com/resilience4j/resilience4j/issues
- type: License
  url: https://github.com/resilience4j/resilience4j/blob/master/LICENSE.txt
- type: MavenCentral
  url: https://search.maven.org/search?q=io.github.resilience4j
- type: SpringBoot
  url: https://resilience4j.readme.io/docs/getting-started-3
- type: Micronaut
  url: https://resilience4j.readme.io/docs/getting-started-4
- type: SpringDemo
  url: https://github.com/resilience4j/resilience4j-spring-boot-demo
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com