LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.
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Apereo CAS - Identity & Single Sign On for all earthlings and beyond.
- sso-authentication
- authentication
- authorization
- java
A tool for mocking HTTP services
- wiremock
- json
- mocking
- stubbing
Java DSL for easy testing of REST services
Apache Camel is an open source integration framework with 350+ connectors. Write routes in Java, YAML, or XML. Run on Spring Boot, Quarkus, or standalone. Apache License 2.0.
- camel
- integration
- java
- microservices
Library for OpenAPI 3 with spring-boot
- openapi3
- spring-boot
- springdoc-openapi
- swagger-ui
A graph database that supports more than 100+ billion data, high performance and scalability (Include OLTP Engine & REST-API & Backends)
- database
- graph-database
- graph
- gremlin
Security engine for Java (authentication, authorization, multi frameworks): OpenID Connect, SAML2, CAS, OAuth, LDAP, JWT...
SirixDB is an an embeddable, bitemporal, append-only database system and event store, storing immutable lightweight snapshots. It keeps the full history of each resource. Every commit stores a space-efficient snapshot through structural sharing. It is log-structured and never overwrites data. SirixDB uses a novel page-level versioning approach.
- xquery
- java
- temporal-data
- storage
Apache OFBiz is an open source product for the automation of enterprise processes. It includes framework components and business applications for ERP, CRM, E-Business/E-Commerce, Supply Chain Management and Manufacturing Resource Planning. OFBiz provides a foundation and starting point for reliable, secure and scalable enterprise solutions.
- geospatial
- ofbiz
- web-framework
- java
zerocode-tdd is a community-developed, free, open-source, outcome-driven automated testing framework for Data Pipelines, ETL, REST API, Kafka(Data Streams), Databases and Load scenarios. all defined in simple JSON or YAML — with zero coding.
- soap
- assertions
- java
- api
True Object-Oriented Java Web Framework without NULLs, Static Methods, Annotations, and Mutable Objects
- java
- web-framework
- xml-xslt
- http
Apache Wicket - Component-based Java web framework
- java
- apache
- web
- html
API Gateway bridging modern and legacy APIs with WSDL-to-OpenAPI, SOAP-to-REST, XML, OAuth2, and GraphQL.
Elegance, high performance and robustness all in one java bean mapper
- annotations
- xml
- java
- jmapper
Security library for Vert.x: OpenID Connect, SAML2, CAS, OAuth, LDAP, JWT...
Generate production-ready Spring Boot backend boilerplate from a single YAML or JSON spec.
Apache JMeter Plugin to convert a HAR file to a JMeter script and Record XML file
- convertor
- har
- jmeter
- jmeter-plugin
Code-first ORM for Spring Boot. Zero XML, Auto DDL & Fluent Join API. Define your schema in Java and enjoy dynamic SQL power.
- code-generator
- database
- dynamic-sql
- java
Demo of high performance AI model (pmml export) evaluator api base on Vert.x, Supports dynamic routing configuration for multiple pmml models via JSON
- pmml
- ai
- java-pmml
- verticle
Vertx-MongoDB-Effect enables interaction with MongoDB in a purely functional and reactive style, seamlessly integrating with Vertx-effect. This library requires familiarity with Vertx-effect, as both frameworks share a foundational reliance on immutability and persistent data structures provided by json-values.
- functional-programming
- javascript
- json-values
- mongodb