On a recent client project, we ended writing more than 300 business rules to reflect some of the financial decision making that they applied to an application (excuse me if I’m being suitably vauge with this). Many of these rules would be shared across applications. The rules engine used was the Java based JBoss rules engine (formerly known as Drools).
Obviously , these rules need to be stored somewhere. Most large organisations are comfortable with the idea of using a Database such as Oracle or Sql-Server to carry out this task. This article , for version 2 of Drools but also applicable to the latest release, shows you how to use a database to store your business rules.