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BMT/CMT and JDBC Transaction

 
Greenhorn
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What is the difference between BMT UserTransaction/CMT and JDBC Transaction?

So does the database be updated finally by the following?

UserTransaction.begin();
//some db update code
Connection.commit();
UserTransaction.rollback();
 
Ranch Hand
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According to the spec 17.3.3, you are not supposed to use Connection.commit() :

The Bean Provider uses the UserTransaction interface to demarcate transactions. All updates to the resource managers between the UserTransaction.begin() and UserTransaction.commit() methods are performed in a transaction. While an instance is in a transaction, the instance must not attempt to use the resource-manager specific transaction demarcation API (e.g. it must not invoke the commit() or rollback() method on the java.sql.Connection interface or on the javax.jms.Session interface).
 
King Hong Chan
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So will there be an exception or just the target database is updated even the user transaction is rollback?
 
King Hong Chan
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Moreover, if there is any definition in the deployment descriptor, what is the default transaction attribute for the CMT beans?
 
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