Hi,
Hibernate executes the statements only on flushing, which is most of the time
at the end of a tx. It means, any database related exception (foreign key
constraint or unique constraint etc.) will be thrown in a deferred fashion(not
at the time of invocation, but at the time of tx commitment). At the end of
the 5 and 6 JSF phases, a TransactionRolledBackException is thrown, when all
action methods have been executed. There is no chance to catch such kind of
ConstraintException in service layer or in JSF actions.
What is the best-practice for handling these exceptions?
The normal behaviour I excpeted from the system is to add a faces message and
stay on the same view. I think the only guy who can do this job is a
ExceptionHandler. First question is why not allow to add user defined
ExceptionHandler? Second question is: Can I use any of the existing handler to
implement the desired behaviour? In the documentation I only see examples which
redirects to another view. Is there a shortcut (EL-expression) to find out the
current view and use it as thre redirection target? If not, I would like to
implement it. My plan is to use a PhaseListener to catch the current view and
put it somewhere (request attribute or thread locale, anyway, anywhere
reachable by a EL-expression) for later use and configure in the pages.xml
<exception class="javax.persistence.PersistenceException">
| <end-conversation/>
| <redirect view-id="{el-expression-to-the-current-view}">
| <message>Database access failed</message>
| </redirect>
| </exception>
|
I would like to know your opinions to the solution. Whether you have better
suggestion or see general problems
thx for your feedback!
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