Oracle RAC 11gR1 and JDBC / Hibernate issue

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Is there a known issue with RAC and Hibernate or JBDC 10.2.04 driver and Tomcat6?    We're getting errors, but only when using Hibernate.  The oracle client connects just fine.  I'm sorry that i can't figure out how to search these discussions, so if this has been answered multiple times, forgive me for asking again.
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