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ActiveJ is an ambitious platform that was built from the ground up and aims to redefine modern Java programming. ActiveJ is the result of developing a genuinely high-load ecosystem for AdKernel, a Real Time Bidding ad-serving platform processing hundreds of billions requests daily. ActiveJ features a rich stack of technologies without zoo of diverse solutions tailored together with excessive abstractions. It's a full-featured high-performance alternative to Spring, Micronaut, Apache Spark, Quarkus, and other solutions.

Core Features#

ActiveJ distinctive features are simplicity, raw performance and consistency. As a result, it is fast, lightweight and doesn’t feature tons of abstractions and third-party dependencies. Moreover, ActiveJ offers a unique programming approach, giving priority to business logic instead of framework specifications.

Platform Structure#

ActiveJ consists of loosely coupled components that complement and empower each other. Some of them can be used as stand-alone libraries.

Core components:#

  • ActiveJ Inject. Lightweight Dependency Injection library with powerful tools. Can be used as a stand-alone library.
  • Async I/O core: Promise, Eventloop, Net.
  • Lightning-fast and asynchronous data stream processing: Datastream, CSP.
  • High-performance HTTP component, features asynchronous HTTP clients and servers. Can be used independently of ActiveJ.
  • Bootstrapping and lifecycle management utils: Launcher, Service Graph, JMX, Triggers.

Bytecode manipulation tools:#

  • ActiveJ Serializer - world’s fastest JVM-based serializers implemented with runtime bytecode generation.
  • ActiveJ Codegen - dynamic bytecode generator without the complexity of direct bytecode manipulation. Features a streamlined and concise API.
  • ActiveJ Specializer - a unique technology that automagically significantly speeds up your code by optimizing it for JVM.

Cluster technologies:#

  • ActiveJ RPC - a lightning-fast binary protocol for developing distributed applications and microservices solutions
  • ActiveJ FS - provides efficient tools for developing scalable remote file storage with support of data redundancy, rebalancing, and resharding.

ActiveJ Background#

ActiveJ project is an enhanced version of the DataKernel framework. After v3.0 release it was significantly improved and restructured.