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From Gareth Davis <>
Subject Re: Binding multiple values to a single immutable object
Date Tue, 03 Nov 2009 13:09:52 GMT
Thanks, their is a further complexity in my system, in that the exact type
of the Value isn't actually known at compile time it is actually a kinda
urber configurable form display, hence the desire to use a TypeConverter,
but I think you are right and a different approach is inevitable. Currently
looking at binding to a Map of strings and doing the type conversation my


2009/11/3 Robert Graf-Waczenski <>

> Gareth Davis schrieb:
>  The more I look at the Ognl stuff and the ParametersIntercepter the
>> more I've convincing my self that this is just not possible with the
>> framework, can anybody confirm this?
> Others may have a deeper knowledge of the framework, but i would approach
> your issue differently. Since setters for your html form fields are called
> independently of each other and in an unpredictable order, you should code
> your action to have separate members for each of the getters/setters and
> have your Date instance created properly in your action method. Or you
> implement a weaker form of immutability that allows an object to shortly
> exist in an non-immutable state (so you can new it with empty members and
> have it being accessed directly from your setters) and then "petrify" the
> object in your action method. We in our project have invented such a pattern
> ten years ago and are using it ever since without looking back :-)
> Robert
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