I think you can use the format:
<t:formatnull value="${contract?.manager?.address?.city?.name}" />
... where if any of the hierarchy is null is will stop trying to evaluate
methods / properties on subordinates, avoiding your NPE.
Regards,
Jim.
-----Original Message-----
From: Dmitriy Vsekhvalnov [mailto:dvsekhval...@gmail.com]
Sent: 14 October 2010 09:01
To: users@tapestry.apache.org
Subject: Component to format null values
Hello all,
i'm looking to some approach to render property value or some default string
if value is null.
Something like:
<t:formatnull value="contract.name" />
I have no problem to implement such component,but i want this to work with
property chains as well:
<t:formatnull value="contract.manager.address.city.name" />
where i want default string to be rendered, if any of intermediate values
evaluated to null. Now i'm getting NPE.
Is there are any service in tapestry which i can use for property
expressions evaluation or any other ideas?
Thanks.
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