JDBC Drivers in 11g R1 vs. R2

Is there a major difference between JDBC drives of ORacle 11gR1 and R2?

Which version of JDBC drives you are talking about??? the one that comes with R1 vs. R2
If 'major' means 'is there something new?', such a question is answered in the New Features Guide:
http://download.oracle.com/docs/cd/E11882_01/server.112/e17128/toc.htm
(And indeed there are some enhancements for JDBC drivers).
Werner The 'major' to the extent that J2EE app need changes. Are they backward compatible with previous versions up to 10g?
My knowlege of Java or JDBC is limited.

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