What are some open source applications which have a robust external API calls implementations ?

This page summarizes the projects mentioned and recommended in the original post on reddit.com/r/java

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  • GitHub repo Hystrix

    Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable.

    Let met explain. Request/Reply can need retry but its latency and retry constraints are far different than Pub/Sub (aka fire and forget). Request/Reply retry patterns are best seen in Netflix Hystrix w/ the bulkhead pattern.

  • GitHub repo javaslang-circuitbreaker

    Resilience4j is a fault tolerance library designed for Java8 and functional programming

    Hystrix as been deprecated in favour of https://github.com/resilience4j/resilience4j

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  • GitHub repo Sentinel

    A powerful flow control component enabling reliability, resilience and monitoring for microservices. (面向云原生微服务的高可用流控防护组件)

  • GitHub repo Activiti

    Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.

  • GitHub repo conductor

    Conductor is a microservices orchestration engine. (by Netflix)

  • GitHub repo mycollab

    An open source, free, high performance, stable and secure Java Application Business Platform of Project Management and Document

  • GitHub repo cloud-native-starter

    Cloud Native Starter for Java/Jakarta EE based Microservices on Kubernetes and Istio

  • OPS

    OPS - Build and Run Open Source Unikernels. Quickly and easily build and deploy open source unikernels in tens of seconds. Deploy in any language to any cloud.

  • GitHub repo thorntail

    Source code for the Thorntail project

  • GitHub repo Springy-Store-Microservices

    Springy Store is a conceptual simple μServices-based project using the latest cutting-edge technologies, to demonstrate how the Store services are created to be a cloud-native and 12-factor app agnostic. Those μServices are developed based on Spring Boot & Cloud framework that implements cloud-native intuitive, design patterns, and best practices.

  • GitHub repo api-layer

    The API Mediation Layer provides a single point of access for mainframe service REST APIs.

  • GitHub repo failsafe

    Fault tolerance and resilience patterns for the JVM

    I like Failsafe personally. Nice clear API.

  • GitHub repo java-slack-sdk

    Slack Developer Kit (including Bolt for Java) for any JVM language

    Slack's API Client is fairly robust, with retries, async client, rate limiting support.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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