Skip to main content

Eclipse Krazo

Eclipse Krazo is an open-source implementation of the Model-View-Controller (MVC) specification for Jakarta EE (web application framework), providing a structured pattern for building server-side web applications on the Jakarta EE platform.

  • MVC framework implementation for Jakarta EE (web application framework)
  • Supports separation of concerns between model, view, and controller in server-side applications (application architecture)
  • Integrates with standard Jakarta EE technologies such as CDI and JAX-RS where specified (enterprise Java platform)
  • Provides annotation-based controller definitions and view resolution mechanisms (web MVC programming model)
  • Developed under the Eclipse Foundation governance model as part of the Eclipse EE4J ecosystem (open-source governance)

More About Eclipse Krazo

Eclipse Krazo is an implementation of the Jakarta MVC specification (web application framework) within the Jakarta EE ecosystem, designed to support the Model-View-Controller pattern for server-side Java applications. It aligns with the MVC Application Programming Interface (API) defined for Jakarta EE so that developers can structure web applications with dedicated components for handling Hypertext Transfer Protocol (HTTP) requests, processing business logic, and rendering views. The project operates under the Eclipse EE4J umbrella at the Eclipse Foundation (open-source governance), which hosts a collection of enterprise Java projects.

The primary purpose of Eclipse Krazo is to provide a concrete runtime for the Jakarta MVC programming model (web MVC programming model). Within this model, controllers handle incoming web requests, interact with application data or services, and delegate to views for rendering responses. Krazo supports annotation-driven controllers, model exposure, and view resolution so that developers can Marketing Automation Platform (MAP) URLs to controller methods and return view identifiers that the framework resolves to templates or other rendering technologies. This supports a pattern where view technologies remain decoupled from controller code.

Eclipse Krazo is designed to integrate into Jakarta EE application servers that support Jakarta MVC and related specifications (enterprise Java platform). It builds on other Jakarta EE technologies referenced by the MVC specification, including Contexts and Dependency Injection (CDI) for dependency management and request lifecycle handling, and JAX-RS for RESTful request mapping where applicable (dependency injection, RESTful web services). Through these integrations, Krazo enables applications to use standard Jakarta EE features such as declarative dependency injection, scopes, and interceptors in MVC controllers.

In enterprise and institutional environments, Eclipse Krazo is used for building maintainable server-side web applications that need clear separation between HTTP endpoints, domain logic, and presentation templates (enterprise web development). Architects and developers can employ Krazo as the MVC layer on top of an existing Jakarta EE stack, deploying applications to compatible application servers. The project fits into architectures where Jakarta EE provides the base platform for messaging, persistence, security, and transactions, while Krazo handles request routing and view handling for web interfaces.

From a directory and taxonomy perspective, Eclipse Krazo is categorized as an open-source implementation of the Jakarta MVC specification for Jakarta EE (web application framework, Java enterprise stack). It belongs to the broader Eclipse EE4J family of enterprise Java technologies and interoperates with the Jakarta EE APIs defined for web and server-side development. Its role is to supply an MVC framework aligned with Jakarta standards so that organizations standardizing on Jakarta EE can adopt a consistent model-view-controller programming model across their web applications.