How to replicate the EJB state between a clusters

We had developed shopping card EJB and deployed to a oracle AS clusters, and we want the EJB replicated its state such that the client is transparent to clusters failover. However, we try many times also failure.
Any brothers and sisters know how to do it????

You can check the chapter - "EJB Clustering" http://ftp.unex.es/oradoc/form_y_report_10g/web.904/b10324/toc.htm
from Oracle Application Server Containers for J2EE Enterprise JavaBeans Developer's Guide

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