There is an open-source project called Clustered-JDBC (http://c-jdbc.objectweb.org) that allows any Servlets/JSP to transparently access a cluster of databases through JDBC.
C-JDBC offers both performance scalability and fault tolerance to the database tier by using various replication techniques. It has been successfully tested with Tomcat and does not require any application or database changes (it just works as a simple JDBC driver). C-JDBC is 100% Java code and licensed under LGPL.
I think this could be useful for many users from the Tomcat community.
Check out the web site (http://c-jdbc.objectweb.org) and download code and documentation from the SourceForge (http://forge.objectweb.org/projects/c-jdbc/).
Emmanuel
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