The integrated Web application server for i is a lightweight Java application server integrated into the operating system. The integrated Web application server contains an Open Services Gateway initiative (OSGi)-based Web servlet container that is readily accessible and provides a flexible foundation for developing jsp and servlet-based Java applications. The integrated Web application server delivers a clear path to the advanced capabilities of the WebSphere middleware portfolio.
Future of integrated web application server versions 7.1 and 8.1 (November 1, 2015)
Support has been withdrawn for the integrated web application server (IAS) version 7.1. Servers based on IAS 7.1 will continue to run on IBM i 7.2 and previous releases, but any problems you encounter will require you to redeploy the application to a more recent version of the IAS server, preferably IAS 8.5 or newer version. In addition, IAS 8.1 and 7.1 servers will not function beyond IBM i 7.2. Thus customers are highly encouraged to transition to IAS 8.5 or newer version as soon as possible.
Note that the above statement will affect Integrated Web Services (IWS) servers since the servers are based on the IAS server.