Best JSON-RPC for Java Alternatives & Competitors in 2025

RxJava – Reactive Extensions for the JVM is a library for composing asynchronous and event-based programs using observable sequences.

Key RxJava features:

Asynchronous Programming Composability Error Handling Rich Operator Set

Open Source

Google core libraries for Java 6+.

Key Guava features:

Comprehensive Collection Utilities Functional Programming Features Enhanced String Manipulation Concurrency Utilities

Open Source

As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more.

Key DocRaptor features:

Ease of Use Customizable High-Quality Rendering Compliance

Try for free paid Free Trial $15.0 / Monthly (125+ Documents)

Quarkus: Supersonic Subatomic Java. . Contribute to quarkusio/quarkus development by creating an account on GitHub.

Key Quarkus features:

Fast Startup Time Low Memory Footprint Developer Productivity Extensive Extension Ecosystem

Application and Data, Languages & Frameworks, and Java Tools.

Key Lombok features:

Boilerplate Reduction Improved Readability Annotation-based IDE Integration

Open Source

A PHP Framework For Web Artisans.

Key Laravel features:

Eloquent ORM Blade Templating Engine Artisan CLI Strong Community and Ecosystem

Open Source

From Wikipedia, the free encyclopedia.

Key vert.x features:

Performance Polyglot Modular Reactive Ecosystem

Open Source

MyBatis is a top-rated SQL-based data mapping solution used by Programmers, Software Engineers, and Database Architects for developing object-oriented software applications.

Key MyBATIS features:

Simplicity Flexibility in SQL Performance Mapping

Thymeleaf is a modern server-side Java template engine for both web and standalone environments.

Key Thymeleaf features:

Natural Template Approach Server-Side Rendering Spring Integration Rich Features

Open Source

Ktor is a tough gig developmental platform that comes with the support to build asynchronous servers and clients right in the kotlin.

Key Ktor features:

Asynchronous and Non-blocking Kotlin-first Flexible and Modular Architecture Multi-platform Capabilities

Open Source

The Web framework for perfectionists with deadlines.

Key Django features:

Rapid Development Scalability Security ORM (Object-Relational Mapping)

Open Source

Spark Framework is a simple and lightweight Java web framework built for rapid development.

Key Spark Framework features:

Ease of Use Lightweight Java 8 Lambda Support Rapid Development

AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.

Key AngularJS features:

Two-way data binding Dependency Injection Modular Development Community and Ecosystem

A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible.

Key Java features:

Platform Independence Large Standard Library Robust and Secure Community Support