Return a descriptor for this transaction attribute,
or null if none.
public boolean rollbackOn(java.lang.Throwable ex)
The default behavior is as with EJB: rollback on unchecked exception
(RuntimeException), assuming an unexpected outcome outside of any
business rules. Additionally, we also attempt to rollback on Error which
is clearly an unexpected outcome as well. By contrast, a checked exception is
considered a business exception and therefore a regular expected outcome of the
transactional business method, i.e. a kind of alternative return value which
still allows for regular completion of resource operations.
This is largely consistent with TransactionTemplate's default behavior,
except that TransactionTemplate also rolls back on undeclared checked exceptions
(a corner case). For declarative transactions, we expect checked exceptions to be
intentionally declared as business exceptions, leading to a commit by default.