Apache Geronimo in Encyclopedia

IBM has 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 based on Geronimo.^[1] Other commercial supporters include AMD, Chariot Solutions, Simula Labs and Virtuas.

Components

Like an enterprise operating system, Geronimo is built on a kernel -- a microkernel 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 which is based on the concept of Inversion of Control (IoC) (sometime called Dependency Injection), which means that the kernel has no direct dependency on any of its components. 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.

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 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 projects.

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

Component	Description
Apache Tomcat	HTTP server and Servlet container supporting Java Servlet 2.5 and JavaServer Pages (JSP) 2.1.
Jetty	HTTP server and Servlet container supporting Java Servlet 2.5 and JavaServer Pages 2.1 -- an alternative to the Tomcat server.
Apache ActiveMQ	Open source Java Message Service (JMS) 1.1 applications provider and supporter of message-driven beans (MDBs).
Apache OpenEJB	Open source Enterprise JavaBeans (EJB) Container System and EJB Server that supports Enterprise JavaBeans at the 3.0 level, including Container Managed Persistence 2 (CMP2) and EJB Query Language (EJBQL).
Apache OpenJPA	Open source Java Persistence API (JPA) 1.0 implementation.
Apache ServiceMix	Open source Enterprise Service Bus (ESB) and component suite based on the Java Business Integration (JBI) standard on JSR 208.
Apache Axis and Apache Scout	Axis is a Simple Object Access Protocol (SOAP) implementation, while Scout is a JSR 93 (JAXR) implementation. These provide support for Web Services and Web Services Interoperability Organization (WS-I) Basic Profile support.
Apache CXF	Web Services frameworks with variety of protocols such as SOAP, XML/HTTP, RESTful HTTP, or CORBA and work over a variety of transports such as HTTP, JMS or JBI.
Apache Derby	Full-fledged relational database management system (RDBMS) with native Java Database Connectivity (JDBC) support.
Apache WADI	Clustering, load balancing and failover solution for the web application container tier ^[1].
MX4J	Java Management Extensions that supplies tools for managing and monitoring applications, system objects, devices and service oriented networks.

Apache Geronimo

Contents

Components

References

Bibliography

See also

External links

Presentations