$! will just avoid printing a NULL value.
Best will be to wrap your objects before place them in the Velocity
context. Export only those methods that you will used in Velocity and
catch non-critical exceptions(those that can be converted to a "missing
value").
Or even better, I would recommend to place in the context only
POJOs(Plain Java Objects) and not complex/heavy weight objects. Avoid
lazy initializations(like Hibernate lazy initialized
collections/objects) because of two reasons : if it fails, it fails
during rendering(which should not happen, your data should be already
"collected", ready to be rendered) and if you measure(this matters only
if you measure it :) ) the page rendering time it will give you wrong
results(you will blame Velocity for slow rendering or just how the
template was done).
Prepare your data in the business layer and if nothing fails render your
data with Velocity to get the result page.
Is not possible all the time to have all your data ready before
rendering(for performance reasons), but try to avoid that as much as
possible.
Nathan Bubna wrote:
that won't catch exceptions. you need to use an event handler,
particularly the MethodExceptionEventHandler.
On Wed, Sep 10, 2008 at 11:44 PM, Manish <[EMAIL PROTECTED]> wrote:
use this -
my name is: $!o.foo()
rgds,
- Manish
----- Original Message ----- From: "bluejoe" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, September 11, 2008 12:09 PM
Subject: question on Velocity: How to let Velocity keep silent when some
exceptions occur?
Hi, I am a user of Velocity, now I have a question: How to let Velocity
keep silent when some exceptions occur?
For example, I wrote codes:
my name is: $o.foo()
In some cases, foo() may throw some exceptions, like NullException, etc.
It seems that Velocity will throw these exceptions too. But I want Velocity
to regard the statement as:
my name is: <empty>
Is there any way to let Velocity ignore the errors?
Sincerely Yours,
bluejoe
2008-9-11
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