Apache Geronimo is an

open source Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized so ...

application server An application server is a server that hosts applications or software that delivers a business application through a communication protocol. An application server framework is a service layer model. It includes software components available to a ...

developed by the

Apache Software Foundation The Apache Software Foundation (ASF) is an American nonprofit corporation (classified as a 501(c)(3) organization in the United States) to support a number of open source software projects. The ASF was formed from a group of developers of the ...

and distributed under the Apache license. Geronimo 3, the current version, is compatible with the Java Enterprise Edition (Java EE) 6 specification and therefore supports technologies such as JMS, Enterprise JavaBeans, Connectors,

servlets A Jakarta Servlet (formerly Java Servlet) is a Java software component that extends the capabilities of a server. Although servlets can respond to many types of requests, they most commonly implement web containers for hosting web applicat ...

, JSP, JSF,

Unified Expression Language The Jakarta Expression Language (EL; formerly Expression Language and Unified Expression Language) is a special purpose programming language mostly used in Jakarta EE web applications for embedding and evaluating expressions in web pages. The ...

and JavaMail. This allows developers to create enterprise applications that are portable and scalable, and that integrate with legacy technologies. The older Geronimo 2 is compatible with Java EE 5. IBM has in the past provided considerable support to the project through marketing, code contributions, and the funding of several project committers. In October 2005, IBM announced a free edition of its

WebSphere IBM WebSphere refers to a brand of proprietary computer software products in the genre of enterprise software known as "application and integration middleware". These software products are used by end-users to create and integrate applications ...

application server named Websphere Application Server Community Edition (WASCE), which is actually a distribution of Geronimo and despite its name not related to the commercial WebSphere server. However, IBM has withdrawn marketing and support for WASCE in 2013. Other commercial supporters included AMD, Chariot Solutions, Simula Labs, and Virtuas. Activity on Apache Geronimo has now largely ceased. Previous prolific Geronimo committers like David Jencks and others who are at IBM are now working on the Liberty Profile application server.

Components

Like an enterprise

operating system An operating system (OS) is system software that manages computer hardware, software resources, and provides common daemon (computing), services for computer programs. Time-sharing operating systems scheduler (computing), schedule tasks for ef ...

, Geronimo is built on a

kernel Kernel may refer to: Computing * Kernel (operating system), the central component of most operating systems * Kernel (image processing), a matrix used for image convolution * Compute kernel, in GPGPU programming * Kernel method, in machine learn ...

—a

microkernel In computer science, a microkernel (often abbreviated as μ-kernel) is the near-minimum amount of software that can provide the mechanisms needed to implement an operating system (OS). These mechanisms include low-level address space management, ...

that lays the foundation for everything above it. Geronimo's kernel is Java EE agnostic. Its sole purpose is to manage Geronimo's building blocks. Geronimo is marked by an architectural design that is based on the concept of

Inversion of Control In software engineering, inversion of control (IoC) is a design pattern in which custom-written portions of a computer program receive the flow of control from a generic framework. A software architecture with this design inverts control as co ...

(IoC) (sometimes called Dependency Injection), which means that the kernel has no direct dependency on any of its

components Circuit Component may refer to: •Are devices that perform functions when they are connected in a circuit. In engineering, science, and technology Generic systems *System components, an entity with discrete structure, such as an assemb ...

. The kernel is a framework for services that controls the service life cycle and

registry Registry may refer to: Computing * Container registry, an operating-system-level virtualization registry * Domain name registry, a database of top-level internet domain names * Local Internet registry * Metadata registry, information system for re ...

. The kernel is based on Java EE. It works with Java EE services and components to build specific configurations—one of which is a full Java EE

solution stack In computing, a solution stack or software stack is a set of software subsystems or components needed to create a complete platform such that no additional software is needed to support applications. Applications are said to "run on" or "run on ...

. A majority of the Geronimo services are added and configured through GBeans to become a part of the overall application server. A ''GBean'' is the interface that connects the component to the kernel. Each GBean can maintain state, depend on, and interrelate with other GBeans, and operate on events from the kernel and other GBeans. The GBeans interface makes it possible to switch between two

servlet container A web container (also known as a servlet container; and compare "webcontainer" ) is the component of a web server that interacts with Jakarta Servlets. A web container is responsible for managing the lifecycle of servlets, mapping a URL to a par ...

s, for example

Jetty A jetty is a structure that projects from land out into water. A jetty may serve as a breakwater, as a walkway, or both; or, in pairs, as a means of constricting a channel. The term derives from the French word ', "thrown", signifying somet ...

or Tomcat, without affecting the whole architecture using a GBeans interface. This flexible architecture makes it possible for the Geronimo developers to integrate several existing field-tested

open source software Open-source software (OSS) is computer software that is released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software and its source code to anyone and for any purpose. Open ...

projects. Here a list of the open source components that are included in the Geronimo project.

References

Bibliography

* * * *

External links

Apache Geronimo
{{Java (Sun)

Geronimo Geronimo ( apm, Goyaałé, , ; June 16, 1829 – February 17, 1909) was a prominent leader and medicine man from the Bedonkohe band of the Ndendahe Apache people. From 1850 to 1886, Geronimo joined with members of three other Central Apache b ...

Java enterprise platform Free software application servers

Components

See also

References

Bibliography

External links