Java middleware

19 reusable middleware libraries for Java, indexed by capability.

• Awesome-AI-resources

  by arpita612 · Free · github

  💻 Discover essential AI-driven tools, frameworks, and resources to enhance your development process and streamline your projects.

  AIAPI   Java

• Casbin

  by Casbin · Free · Apache-2.0 · middleware

  Authorization library supporting access-control models like ACL, RBAC, and ABAC.

  AuthorizationSecurity   GoJavaNode.jsPythonPHPC#

• cli-assured

  by cli-assured · Free · github

  Java DSL for testing command line applications

  Developer ToolsTesting   Java

• dcl350-2026-jan-19

  by zvfas · Free · github

  🌐 Implement microservices with Spring Cloud, covering service discovery, configuration, API gateway, and resilience patterns for effective architecture.

  AI   Java

• demo-springboot-keycloak-auth-crud

  by nik1842812 · Free · github

  🔐 Secure your API with this Spring Boot demo using Keycloak for authentication, user registration, role management, and CRUD operations.

  AuthenticationAuthorizationAPIDatabase   Java

• FastNoiseLite

  by Auburn · Free · MIT · middleware

  Fast, portable noise generation library for procedural generation (terrain, textures, worlds).

  Procedural GenerationTerrain   C++C#JavaJavaScriptPythonRust

• first-run

  by alfaarizi · Free · github

  Embeddable customer-activation agent for small B2B SaaS companies

  AIUIMessagingAPI   Java

• github-ai-assistant

  by monuro · Free · github

  🤖 Boost your development workflow with this AI-powered GitHub command-line assistant for quicker and smarter coding.

  AIAPI   Java

• ilo

  by metio · Free · github

  manage reproducible build environments

  Developer Tools   Java

• jhelm

  by alexmond · Free · github

  Helm for the JVM — render charts and manage releases in pure Java, byte-for-byte compatible with `helm template`. Library, Spring Boot starter, REST API, MCP server (AI tools), and CLI.

  AI   Java

• notes-management-system

  by MaryAWashington · Free · github

  📝 Manage your notes effortlessly with a Spring Boot application, featuring database control with Liquibase and PostgreSQL for reliable data management.

  Developer Tools   Java

• ONNX Runtime

  by Microsoft · Free · MIT · middleware

  Cross-platform inference and training accelerator for machine-learning models.

  Machine LearningAI   PythonC#C++JavaJavaScript

• personal-developer-analytics

  by julia-shtal · Free · github

  Self-hosted developer analytics platform tracking DORA/SPACE metrics (PR lead time, churn, focus ratio, etc.) from Git, GitHub, and Jira. Privacy-first Spring Boot + React app with team dashboards and RBAC.

  Analytics   JavaReact

• Protocol Buffers

  by Google · Free · BSD-3-Clause · middleware

  Language-neutral, platform-neutral mechanism for serializing structured data.

  SerializationAPI   C++JavaPythonGoC#JavaScript

• stacklens

  by AbaSheger · Free · github

  Offline Java CLI that analyzes Spring Boot logs and stack traces — detects 13 failure types, shows exact location (class + line), occurrence counts, and severity. Pipe from kubectl or docker logs

  LoggingDeveloper Tools   Java

• Stripe

  by Stripe · Per-transaction · Commercial · middleware

  Payments infrastructure — accept cards and wallets, subscriptions, and billing via API and SDKs.

  PaymentsCommerce   WebNode.jsPythonPHPJavaGoAndroidiOS

• SulphurAPI

  by CareBobo · Free · github

  🔍 Automate OWASP API Top 10 detection with SulphurAPI, a Burp Suite extension for reliable API security testing and advanced OpenAPI parsing.

  AutomationAPI   Java

• todo-clean-architecture

  by bratucubogdan · Free · github

  📝 Build a Todo app with Clean Architecture using React, Express, and MongoDB, focusing on modularity and separation of concerns for maintainable code.

  Developer Tools   JavaReactFlutterAndroid

• wsbg-terminal

  by bsommerfeld · Free · github

  Das Bloomberg Terminal für r/wallstreetbetsGER

  Trading   Java