Andy Piper of BEA has just blogged on WebLogic Event Server - Why we used Spring. One key driver for BEA making Spring central to this product's programming model: Spring's ubiquity. "The answer is pretty simple - use something that developers are already familiar with. Hence, in a word, Spring."

Andy also discusses how BEA were able to use Spring 2.x's extensible configuration mechanism to create a domain specific language for network assembly.

WebLogic Event Server 2.0 is designed for extremely demanding applications. It provides a lightweight front-office infrastructure for low latency, event-driven applications.

Spring is also used in the core of  BEA WebLogic Server 10.