I know a BMT bean A can make use of EJBContext.getUserTransaction(). If this bean calls any CMT bean B then depending upon the transaction-attribute specified in DD the transaction from bean A will be passed to bean B.
Now suppose the client of bean B is not an ejb(say a servlet or swing) and wants to pass its trasaction to the CMT bean. Is this possible? Since client is not an EJB it will will not have UserTransaction reference. Which transaction object it should use. How this can be done?
You can get a UserTransaction Object either from the EJBContext or thru JNDI in an EJB. You can get hold of a UserTransaction Object using JNDI in a servlet and call EJBs. The EJBs get this transaction passed from the servlet based on the CMT transaction attribute.
Here's an example of using transactions from a non ejb client: javax.transaction.UserTransaction userTran; Context ctx = new InitialContext(); userTran = (javax.transaction.UserTransaction)ctx.lookup("java:comp/UserTransaction"); userTran.begin(); //business methods userTran.commit(); This example is straight from the transactions chapter of Mastering Enterprise JavaBeans by Ed Roman et al. The book is freely downloadable at theserverside.com