Explanation/Reference:
An enterprise bean usually creates a timer within a transaction. If this transaction is rolled back, the timer creation also is rolled back.
The transaction will roll back. The creation of the timer will rock back. There will be zero timers.
Note: The UserTransaction interface defines the methods that allow an application to explicitly manage transaction boundaries.
rollback() rolls back the transaction associated with the current thread.
Note 2: size()
Returns the number of elements in this collection. If this collection contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.
Reference: The Java EE 6Tutorial. PartNo: 821- Transactions andTimers