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 and view the source code, design documents, or content of the product. The open source model is a decentrali ...

application server 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 The Apache License is a permissive free software license written by the Apache Software Foundation (ASF). It allows users to use the software for any purpose, to distribute it, to modify it, and to distribute modified versions of the software ...

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

Enterprise JavaBean Jakarta Enterprise Beans (EJB; formerly Enterprise JavaBeans) is one of several List of Java APIs, Java APIs for modular construction of enterprise software. EJB is a server-side component (software), software component that Encapsulation (object ...

s, Connectors, servlets, 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 International Business Machines Corporation (using the trademark IBM), nicknamed Big Blue, is an American Multinational corporation, multinational technology company headquartered in Armonk, New York, and present in over 175 countries. It is ...

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 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 and software resources, and provides common daemon (computing), services for computer programs. Time-sharing operating systems scheduler (computing), schedule tasks for ...

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

components Component may refer to: In engineering, science, and technology Generic systems *System components, an entity with discrete structure, such as an assembly or software module, within a system considered at a particular level of analysis * Lumped e ...

. The kernel is a framework for services that controls the service life cycle and registry. 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 containers, for example

Jetty A jetty is a man-made structure that protrudes from land out into water. A jetty may serve as a breakwater (structure), breakwater, as a walkway, or both; or, in pairs, as a means of constricting a channel. The term derives from the French la ...

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 Software, computer software that is released under a Open-source license, license in which the copyright holder grants users the rights to use, study, change, and Software distribution, distribute the software an ...

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

References

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External links

Apache Geronimo
{{Java (Sun) Geronimo Java enterprise platform Free software application servers

Components

See also

References

Bibliography

External links