Geronimo

Apache Geronimo is an open source application server developed by the Apache Software Foundation and distributed under the Apache license.

Geronimo 2 is currently compatible with the Java Enterprise Edition (Java EE) 5.0 specification such as JDBC, RMI, e-mail, JMS, web services, XML, Enterprise JavaBeans, Connectors, servlets, portlets and JavaServer Pages. This allows developers to create enterprise applications that are portable and scalable, and that integrate with legacy technologies. Geronimo 3 is compatible with Java EE 6.0.

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 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. 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.

The open source components that are included in Geronimo are: Tomcat, Jetty, ActiveMQ, OpenEJB, ServiceMix, OpenJPA, MyFaces, Axis, Scout, CXF, Derby, WADI, MX4J.