One of the key new features in Enterprise JavaBeans 3.0 are interceptors. Actually, the concept of interceptors is not new and has been alive for quite some time. But now, with version 3.0 of the EJB specification they become a standard. And they are as easy to learn and use as everything else in EJB 3.0 and Java EE 5. The EJB container in SAP NetWeaver Application Server, Java EE 5 Edition, as a fully compatible EJB 3.0 implementation, also supports interceptors.
Part 1: https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/5803 Part 2: https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/6660