Demarcate and propagate transactions from web components

Hi,
Can I start a transaction from within a JSP/Servlet and propagate it to EJBs?
For example, say there are EJB1.method1 and EJB2.method2, both marked "required". Code a JSP/Servlet like:
1 UserTransaction tx = ...;
2 tx.begin();
3 EJB1.method1();
4 EJB2.method2();
5 tx.commit();
Does it embrace the two EJB methods in one transaction? What if the web components and EJBs are deployed on different servers physically?
Thanks!
Sunyu

I think you probably want to look at a Web services transactions system that integrates with the JTA. That way you can span your transactions across both a loosely coupled and closely coupled environment. There are some examples at www.arjuna.com
There are several web services transactions specifications out there (OASIS Business Transactions Protocol and IBMs Web Services Transactions, for example). The latter is probably the way to go as it's been designed to interoperate with existing TP systems (it doesn't do that too well at the moment due to "issues" in the spec. but those will be fixed). In addition, JSR 156 is aiming to give J2EE a standard set of interfaces to Web services transactions and interoperability with other J2EE transaction services (JTA and JTS) is high on the agenda.
Mark.

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