This documentation is for WSO2 Complex Event Processor 2.0.0. View documentation for the latest release.

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WSO2 Complex Event Processor (CEP) is a lightweight, easy-to-use, open source Complex Event Processing Server (CEP) available under Apache Software License v2.0. WSO2 CEP identifies the most meaningful events within the event cloud, analyzes their impact, and acts on them in real-time. It's built to be extremely high performing and massively scalable.

WSO2 CEP is built up on the award-winning, WSO2 Carbon platform, which is based on the OSGi framework enabling better modularity for your service oriented architecture (SOA). WSO2 Carbon framework contains many enhanced features and optional components to customize the behavior of the server through simple, point-and-click provisioning. CEP features can be installed in other WSO2 products built on top of the same WSO2 Carbon platform. In other words, CEP is lean and lightweight with just the right set of features needed for efficient functioning, but can also be easily customized and enhanced to according to constantly changing business needs. In other words, WSO2 CEP is future-proof.

CEP can also be tightly integrated with WSO2 Business Activity Monitor, by adding support for recording and post processing events with Map-Reduce via Apache Hadoop.

The WSO2 CEP is an on-going project. It undergoes continuous improvements and enhancements with each new release, to address new business challenges and customer expectations. WSO2 invites users, developers and enthusiasts to get involved or get the assistance from our development teams at many different levels through online forums, mailing lists and support options. We are committed to ensure you a fulfilling user experience at any level of involvement with WSO2 CEP.

Known Issues

For a list of known issues in CEP version 2.0.1, please refer to the following link in WSO2 Oxygen Tank: WSO2 CEP - Known Issues.

Community Resources

WSO2 is willing to provide you guidance for any technical issues or questions regarding the CEP product. You can communicate with the WSO2 CEP development team directly using the relevant mailing lists mentioned here:

WSO2 encourages you to report issues and enhancement requests for WSO2 CEP using the publicJIRA available at You can also track their resolutions and comment on the progress.

Questions regarding the Data Services Server can also be raised through Ensure that you tag the question with appropriate keywords such as WSO2 and Complex Event Processor so that our team can easily find your questions and provide answers.

For tutorials, articles, Webinars and similar resources, visit the WSO2 Oxygen Tank and search under the Resources menu.

Support Options

WSO2 also offers a variety of development and production support programs, ranging from Web-based support during normal business hours, to premium 24x7 phone support. WSO2 is committed to ensuring that your enterprise middleware deployment is completely supported from evaluation to production. Our unique approach ensures that support leverages the open development methodology and is provided by the very same engineers who build the products. For additional support information please refer to 

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