And for completeness, though this is discussed ad infinitum elsewhere.

Thread local patterns are stupid. You can cause database connections to leak
across transaction boundaries with work getting done in random transactions.

Hibernate3 does not use this pattern, it uses the datasource pool as a .... 
pool.
TransactionLocal or sticky transaction connection caching is done by the j2ee
connection manager anyway!

in jboss:

  | <track-connection-by-tx/>
  | 
enabled by default for local-tx-datasource and not really relevant for XA 
(unless the driver
doesn't support interleaving).

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http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3911035#3911035

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