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Posted to user@struts.apache.org by Fred Toth <ft...@synernet.com> on 2007/07/07 17:53:43 UTC

Can freemarker use OGNL null value handling?

Hi,

I'm a big fan of struts2 and freemarker, but I'm just now getting around 
to using
the struts2 UI tags in freemarker.

It appears that "automatic null value handling" feature of struts2 is 
not available from freemarker?

To be more specific: In jsp, you can do this:

<s:textfield name="user.firstName" value="${user.firstName}"/>

This works even when user doesn't exist because of the OGNL null value 
handling.
OGNL discovers that user is null and creates a new user. Likewise for 
firstName.

However, the same tag in freemarker does not work:

<@s:textfield name="user.firstName" value="${user.firstName}"/>

We get an exception "user is undefined". This is presumably because the 
freemarker
expression language is being used, and not OGNL?

So I'm amazed that I have not been able to find a single mention of this 
very important issue!

Am I missing a simple work-around?

Can anyone comment?

Thanks,

Fred Toth



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Re: Can freemarker use OGNL null value handling?

Posted by Musachy Barroso <mu...@gmail.com>.

If I'm not wrong (big if there :) ), that ${user.firstName} is evaluated as
a FreeMarker expression (not a JSTL one), and FreeMarker is sensitive about
nulls:

http://freemarker.sourceforge.net/docs/app_faq.html#faq_picky_about_missing_vars

either use %{user.firstName}, or FreeMarker null operators:

http://freemarker.sourceforge.net/docs/dgui_template_exp.html#dgui_template_exp_missing

musachy

On 7/7/07, Fred Toth <ft...@synernet.com> wrote:
>
> Hi,
>
> I'm a big fan of struts2 and freemarker, but I'm just now getting around
> to using
> the struts2 UI tags in freemarker.
>
> It appears that "automatic null value handling" feature of struts2 is
> not available from freemarker?
>
> To be more specific: In jsp, you can do this:
>
> <s:textfield name="user.firstName" value="${user.firstName}"/>
>
> This works even when user doesn't exist because of the OGNL null value
> handling.
> OGNL discovers that user is null and creates a new user. Likewise for
> firstName.
>
> However, the same tag in freemarker does not work:
>
> <@s:textfield name="user.firstName" value="${user.firstName}"/>
>
> We get an exception "user is undefined". This is presumably because the
> freemarker
> expression language is being used, and not OGNL?
>
> So I'm amazed that I have not been able to find a single mention of this
> very important issue!
>
> Am I missing a simple work-around?
>
> Can anyone comment?
>
> Thanks,
>
> Fred Toth
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>


-- 
"Hey you! Would you help me to carry the stone?" Pink Floyd

Re: Can freemarker use OGNL null value handling?

Posted by Fred Toth <ft...@synernet.com>.

Thanks. That was it! I must have been through the doc a dozen times, but I
missed the '$' vs '%' issue.

Thanks again.

Fred

Dale Newfield wrote:
> Fred Toth wrote:
>> To be more specific: In jsp, you can do this:
>>
>> <s:textfield name="user.firstName" value="${user.firstName}"/>
>>
>> This works even when user doesn't exist because of the OGNL null 
>> value handling.
>
> If you use ${}, you're not using ognl, but rather el.
>
> Try replacing your $'s with %'s.
>
> -Dale
>
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> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
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>
>

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Re: Can freemarker use OGNL null value handling?

Posted by Dale Newfield <Da...@Newfield.org>.

Fred Toth wrote:
> To be more specific: In jsp, you can do this:
> 
> <s:textfield name="user.firstName" value="${user.firstName}"/>
> 
> This works even when user doesn't exist because of the OGNL null value 
> handling.

If you use ${}, you're not using ognl, but rather el.

Try replacing your $'s with %'s.

-Dale

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