[no subject]

" The default is for auto-commit mode to be enabled when the Connection
object is
created. If the value of auto-commit is changed in the middle of a
transaction, the
current transaction is committed. It is an error to enable auto-commit for
a
connection participating in a distributed transaction, as described in
Chapter 12
â??Distributed Transactionsâ??. "

Chapter 12 > 12.4 Transaction Management :
"In contrast to the local case, the boundaries of a
distributed transaction must be controlled by an external transaction
manager that is
coordinating the work of multiple connections. For this reason, it is an
error for
applications to call any of the following Connection methods while they are
participating in a distributed transaction:
 setAutoCommit(true)
 commit
 rollback
 setSavepoint
The JDBC driver throws an SQLException if one of these operations is
attempted
on a connection that is participating in a distributed transaction. If the
connection is
later used for a local transaction, these operations are legal at that
point."