ActiveJ Java platform takes aim at Spring, Quarkus ActiveJ Java platform takes aim at Spring, Quarkus High-performance Java platform born in ad-tech is geared toward high-load web, cloud, networking, and microservices applications Positioned as a replacement for multiple Java technologies, the ActiveJ platform is being put forward as a minimalistic, boilerplate-free, and fast technology stack for web, cloud, microservices, and high-load applications. Consisting of loosely coupled components for asynchronous processing, I/O processing, high-performance web serving, and high-performance networking, ActiveJ, from the company of the same name, was built to replace Spring, Spark, Red Hat Quarkus, Micronaut, Vert.x, and other Java frameworks.