RE: [Springframework-developer] Real OpenSessionInView (only in view)

[Daniel M. <mi...@pa...>]

James,

I don't know of any documents that summarize this behavior. There have been
several discussions of this on the mailing lists though.

I guess I should have elaborated on that part a bit more in my previous
post. Keep in mind that a single session is opened at the beginning of the
request, and that session is used by all data access methods throughout the
request. Now if an DataAccessException occurs during the controller
processing, normally the transaction would be rolled back and the session
discarded immediately. Subsequent data access methods would not continue to
use the session in which the exception occurred, they would create a new
session. However, with the OpenSessionInView pattern the same session
continues to be used for all data access methods including lazy loading
during view rendering--the session is not closed until after the view is
rendered.

With the new implementation that I talked about, the controller logic can
use and discard sessions as needed. A separate session is created for the
view and any objects that need to use that session (e.g. for lazy loading)
will be bound to it before the view is rendered.

~ Daniel



-----Original Message-----
From: spr...@li...
[mailto:spr...@li...]On Behalf
Of James Cook
Sent: Saturday, June 12, 2004 4:43 PM
To: spr...@li...
Subject: RE: [Springframework-developer] Real OpenSessionInView (only in
view)


Daniel,

Is there a document somewhere that summarizes this behavior in Hibernate?
I'm trying to understand what the drawbacks to open session in view are. I
don't understand the point you make about the session not being discarded
[closed properly?].

> -----Original Message-----
> Of Daniel Miller
>
> Hello,
>
> One of the current critiques of the OpenSessionInViewFilter/Interceptor
> that
> ships with Spring is that a Hibernate session is open for the entire
> duration of the request (not just during the rendering of the view). The
> danger here is that a failed session (due to DataAccessException) will not
> be discarded.





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