Top 23 Java REST Projects

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1. openapi-generator

   1 264 26,395 9.9 Java

   OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

   

   Project mention: Stop Advertising in Your Commits | news.ycombinator.com | 2026-05-26

   To be fair I've never used Laravel - but I do have a memory of code generators/scaffolders inserting files that made clear they were responsible for work

   /*

   * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).

   * Do not edit the class manually.

   */

2. SaaSHub

   www.saashub.com featured

   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

3. Dropwizard

   2 9 8,573 9.6 Java

   A damn simple library for building production-ready RESTful web services.

   

   Project mention: Django 6 Released | news.ycombinator.com | 2025-12-04

4. swagger-core

   3 6 7,528 8.7 Java

   Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

   

5. WireMock

   4 28 7,275 9.8 Java

   A tool for mocking HTTP services

   

   Project mention: もうPostmanに頼らない！2025年開発者が選ぶ無料APIツール15選 | dev.to | 2025-12-15

   公式サイト / GitHub：https://wiremock.org

6. REST Assured

   5 2 7,125 9.0 Java

   Java DSL for easy testing of REST services

   

7. JDA

   6 19 4,660 9.1 Java

   Java wrapper for the popular chat & VOIP service: Discord https://discord.com

   

   Project mention: What 1 year of Discord Bot Development taught me | dev.to | 2025-06-21

   The code examples were written in kotlin using the JDA and jda-jtx libraries

8. Discord4J

   7 4 1,914 8.6 Java

   Discord4J is a fast, powerful, unopinionated, reactive library to enable quick and easy development of Discord bots for Java, Kotlin, and other JVM languages using the official Discord Bot API.

   

9. milkman

   8 12 1,335 8.0 Java

   An Extensible Request/Response Workbench

   

10. keycloak-config-cli

    9 10 1,139 9.5 Java

    Import YAML/JSON-formatted configuration files into Keycloak - Configuration as Code for Keycloak.

    

11. product-apim

    10 1 986 9.9 Java

    Welcome to the WSO2 API Manager source code! For info on working with the WSO2 API Manager repository and contributing code, click the link below.

    

12. Microserver

    11 0 935 0.0 Java

    Microserver is a Java 8 native, zero configuration, standards based, battle hardened library to run Java Rest Microservices via a standard Java main class. Supporting pure Microservice or Micro-monolith styles.

    

13. restheart

    12 1 877 9.7 Java

    The Agent-Ready Backend for MongoDB.

    

    Project mention: PostgREST vs RESTHeart | dev.to | 2025-12-17

14. stargate

    13 27 851 8.2 Java

    An open source data gateway

    

15. Javacord

    14 2 774 3.2 Java

    An easy to use multithreaded library for creating Discord bots in Java.

    

16. zilla

    15 10 691 9.3 Java

    🦎 A multi-protocol edge & service proxy. Seamlessly interface web apps, IoT clients, & microservices to Apache Kafka® via declaratively defined, stateless APIs.

    

17. Membrane Service Proxy

    16 1 610 9.8 Java

    Truly open source API gateway with native OpenAPI support. Written in Java, it is easily extensible, supports legacy XML and SOAP, and is optimized for container deployments.

    

18. spring-petclinic-rest

    17 2 578 7.7 Java

    REST version of the Spring Petclinic sample application

    

19. DeepfakeHTTP

    18 34 528 1.8 Java

    DeepfakeHTTP is a web server that uses HTTP dumps as a source for responses.

    

20. elasticsearch-java

    19 2 520 9.2 Java

    Official Elasticsearch Java Client

    

    Project mention: Clean Design, Strong Client: The way of the Elasticsearch's Java SDK | dev.to | 2025-09-21

    ADR-driven decisions: Handcrafted parts are backed by Architecture Decision Records, documenting why certain design choices were made.

21. DB2Rest

    20 5 462 8.5 Java

    Instant no code DATA API platform for relational databases. Connect any database, run anywhere. Power your GENAI application function/tools calls in seconds.

    

22. OpenDJ - Open Identity Plattform Edition

    21 2 433 9.0 Java

    OpenDJ is an open-source LDAP directory server written in Java. It provides robust, scalable, and secure directory services for identity management, access control, and authentication in enterprise environments. OpenDJ supports LDAPv3 standard, replication, REST APIs, and high-performance

    

23. jenkins-rest

    22 1 412 5.4 Java

    Java client, built on top of jclouds, for working with Jenkins REST API

    

24. spring-hateoas-examples

    23 1 396 0.0 Java

    Collection of examples on how (and why) to build hypermedia-driven apps with Spring HATEOAS

    

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• A note from our sponsor - SaaSHub
  www.saashub.com | 13 Jun 2026

  SaaSHub helps you find the best software and product alternatives Learn more →

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