Wednesday, December 21, 2011

WSO2 Enterprise Service Bus 4.0.3 Released!

The WSO2 ESB team is pleased to announce the release of version 4.0.3 of the Open Source Enterprise Service Bus (ESB).

WSO2 ESB is a fast, lightweight and user friendly open source Enterprise Service Bus (ESB) distributed under the
Apache Software Licensev2.0<> .WSO2 ESB allows system administrators
and developers to easily configure message routing, inter mediation,transformation, logging, task scheduling, fail over routing
and load balancing. It also supports transport switching, eventing, rule based mediation and priority based mediation for advanced
integration requirements. The ESB runtime is designed to be completely asynchronous, non-blocking and streaming based on
the Apache Synapse<> mediation engine.

WSO2 ESB  4.0.3  is developed on top of the revolutionary WSO2 Carbon platform<> (Middlewarea' la carte),
an OSGi based framework that provides seamless modularity to your SOA via componentization. This release also contains many new features
and a range of optional components (add-ons) that can be installed to customize the behavior of the ESB. Further, any existing features of the ESB
which are not required to your environment can be easily removed using the underlying provisioning framework of Carbon. In brief, WSO2 ESB can be
fully customized and tailored to meet your exact SOA needs.

You can download this distribution from and give it a try.

New Features in this Release

  • Recipient List Endpoint Type : Recipient endpoint routes cloned copies of a message to each recipient specified in the list.
  • REST API Management : Provides a way to map HTTP requests
  • Support X-Forwarded-For HTTP extension header 
Enhancements in this Release
  • Renamed HTTP Relay transport to Pass-through HTTP transport.
  • Improved builder mediator for selective message building with explicit builder/formatter pair.
  • Fixed number of blocker issues.
Key Features of WSO2 ESB
  • Proxy services - facilitating synchronous/asynchronous transport,  interface (WSDL/Schema/Policy), message format (SOAP 1.1/1.2, POX/REST, Text, Binary), QoS (WS-Addressing/WS-Security/WS-RM) and optimization  switching (MTOM/SwA).
  • Non-blocking HTTP/S transports based on Apache HttpCore-NIO for ultra-fast execution and support for thousands of connections at high concurrency with constant memory usage.
  • Built in Registry/Repository, facilitating dynamic updating and reloading of the configuration and associated resources (e.g. XSLTs, XSD, WSDL, Policies, JS configurations ..)
  • Easily extendable via custom Java classes (mediator and command)/Spring  configurations, or BSF Scripting languages (Javascript, Ruby, Groovy, etc.)
  • Built in support for scheduling tasks using the Quartz scheduler.
  • Load-balancing (with or without sticky sessions)/Fail-over, and  clustered Throttling and Caching support
  • WS-Security, WS-Reliable Messaging, Caching & Throttling configurable  via (message/operation/service level) WS-Policies
  • Lightweight, XML and Web services centric messaging model
  • Support for industrial standards (Hessian binary web service protocol/Financial Information eXchange protocol and optional Health Level-7  protocol)
  • Enhanced support for the VFS (File/FTP/SFTP), JMS, Mail transports with  optional TCP/UDP transports and transport switching among any of the above  transports
  • Support for message splitting & aggregation using the EIP and service  callouts
  • Database lookup & store support with DBMediators with reusable database  connection pools
  • WS-Eventing support with event sources and event brokering
  • Rule based mediation of the messages using the Drools rule engine
  • Transactions support via the JMS transport and Transaction mediator for  database mediators
  • Internationalized GUI management console with user management for  configuration development
  • Integrated monitoring support with statistics, configurable logging and  tracing
  • JMX monitoring support and JMX management capabilities like, Graceful/Forceful shutdown/restart

Bugs Fixed in this Release

This release of WSO2 ESB comes with a number of bug fixes, both in the base framework and the ESB specific components. All the issues which have been fixed in ESB 4.0.3 are recorded at following locations:

Known Issues

All the open issues pertaining to WSO2 ESB 4.0.3 are reported at following

How to Run

  1. Extract the downloaded zip.
  2. Go to the bin directory in the extracted folder
  3. Run the or wso2server.bat as appropriate
  4. Point your browser to the URL https://localhost:9443/carbon
  5. Use "admin", "admin" as the username and password to login as an admin
  6. If you need to start the OSGi console with the server use the property   -DosgiConsole when starting the server. The INSTALL.txt file found on the  installation directory will give you a comprehensive set of options and   properties that can be passed into the startup script
  7. Sample configurations can be started by the wso2esb-samples script   passing the sample number with the -sn option (Please have a look at the samples guide for more information, on running samples)

How to Contribute

Mailing Lists

Join our mailing list and correspond with the developers directly.

Reporting Issues

We encourage you to report issues, documentation faults and feature requests regarding WSO2 ESB through the public ESB
JIRA<>. You can use the Carbon JIRA <> to report any issues related to the Carbon base framework or associated Carbon components.

Discussion Forums

Alternatively, questions could be raised using the forums available.

WSO2 ESB Forum <> : Discussion forum for WSO2 ESB developers/users


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For more details and to take advantage of this unique opportunity please visit

For more information about WSO2 ESB please see

--The WSO2 ESB Team--