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The WSO2 Application Server has Apache Axis2 framework as its core and is distributed under Apache License 2.0. It has full support for Apache Tomcat, which is the underlying Web application container and can be installed standalone or on top of Tomcat, WebSphere, WebLogic, Jboss or as part of a J2EE (Java EE) compliant servlet container.

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The WSO2 Application Server is a light-weight, high-performant and integrated Web services middleware platform. For it's Web service related functionalities, it uses components from the Apache WS-* stack. Apache Axis2 is the heart of the WSO2 Application Server's SOAP processing engine. Other components like Rampart, Sandesha2, Neethi etc. provide the other WS-* capabilities.

Transports

The WSO2 Application Server supports a number of transports through which the clients can send requests. As listed in the figure above, HTTP/S, JMS, Mail, XMPP and TCP are the main transports that are supported. In addition to that, any transport can be easily plugged in using the APIs provided by Axis2. For more information, see Transports.

Web Services

The WSO2 Application Server supports different types of services. A service's type depends on the way the service is developed. However, finally all services are deployed within the Axis2 engine and features are available for all service types. For more information, see Different Service Types.    
Applications

In the standalone mode, the WSO2 Application Server runs on top of an embedded Tomcat instance. This is from where it inherits the Web application deployment capabilities. It also supports development and deployment of other types of applications, including JAX-WS and JAX-RS.

For more information, see Applications.  

Tools

The WSO2 Application Server comes with different kinds of tools for running, testing and monitoring services and applications. For more information, see Tools  and Statistics.

Carbon Context

The WSO2 Application Server has an in-built registry/repository to store the configuration and configuration metadata. It provides the facility to use a remote repository as well.

The WSO2 Governance Registry is something the WSO2 Application Server inherits from the WSO2 Carbon platform, the component-based platform upon which all WSO2 products are built. WSO2 Governance Registry acts as the metadata repository for the deployed services. In addition to that, users can use it for governance features as well. For more information, see Registry Management.  

In addition, the Application Server can be deployed on other Application servers (as a Webapp) like WebSphere, WebLogic and Jboss as well.