UserTransaction

Hi, I'm working in an EJB with transactions handled by the bean, I use
the UserTransaction object to start and finish each transaction, the
EJB has some code like this:

/* ************************* */
ut.begin();
try {
   /* An insert or update query */
   ut.commit()
} catch (Exception e) {
   ut.rollback();
}
.. . .
/* OtherClass was made by somebody else, I only have the jar file not
the source code */
OtherClass otherClass = new OtherClass();
otherClass.setTransaction(ut);
otherClass.doStuff();
.. . .
ut.begin();
try {
   /* An insert or update query */
   ut.commit()
} catch (Exception e) {
   ut.rollback();
}
/* ************************* */

This code can produce errors when the code in the class "OtherClass",
begins a transaction and doesn't execute ut.commit() or ut.rollback().

I know that there is a method called ut.getStatus() that returns the
state of the thread's transaction, my question is, which is the best
way to check the transaction status and execute well ut.commit() or
ut.rollback() ?

Thanks,

Andr=E9s