Re: Problem with the function's error stacktrace and debugging

Hello again Mr Daniel. Thank you for your infos.

I have just made a simple scenario in hope to make your job easier !

Here's the source code : http://tny.cz/6e692350
And here's the ftl : http://tny.cz/6f502578
And here's the whole error in the stdout : http://tny.cz/5260ff75



On Thu, May 9, 2013 at 6:58 AM, Daniel Dekany <[email protected]> wrote:

> Wednesday, May 8, 2013, 1:02:19 PM, Albert Kam wrote:
>
> > I have just faced this situation where the error message is not
> > suffucient to determine stacktrace of ftl-s that lead to the error.
> >
> > So, i have an ftl file :
> >
> > <@layout.main>
> >    my page contents here,
> >    calling another macro here : ${url.myUrlToAnotherPage(paramsHere)}
> > </@layout.main>
> >
> > Now, in the url.ftl file, i have the function of
> > myUrlToAnotherPage, which calls other functions that exist in the
> url.ftl.
> >
> > But the error message only display it like this :
> >
> > Error on line 23, column 48 in lib/url.ftl
> > Expecting a string, date or number here, Expression finalValue is
> > instead a freemarker.template.SimpleSequence
> > The problematic instruction:
> > ----------
> ==>> return [on line 23, column 17 in lib/url.ftl] [on line 23, column 17
> in lib/url.ftl]
> >  in user-directive layout.layout [on line 11, column 1 in
> post/ad/no0035.ftl]
> > ----------
> > With this error message, i know that the rror is on line 23,
> > another function called blah for example. But i dont know who calls
> > blah, it's not in the stack trace.
> > After some dirty removing parts of the page to get the culprit, i found
> out that :
> > - wrap my page as a nested value for another macro (on line 11,
> > displayed on the error stacktrace)
> > - my page calls url.myUrlToAnotherPage function
> > - url.myUrlToAnotherPage calls blahblah function
> > - blahblah calls blah function
> > - blah function errors (on line 23, displayed on the error stacktrace)
>
> Looks like a bug or quality problem in the error reporting. I will try
> to look into it in the future.
>
> > The second thing i want to ask that is related with this is :
> > How do i debug like the simple System.out.println in freemarker
> functions ?
> > Do i have to bind and call the java functions or something cool
> > exists already in freemarker to achieve this ?
>
> Unfortunately not. Something like #log_[trace|debug|info|warn|error]
> should be added, but it wasn't yet done. So for now you have to
> implement your own directive or call a method for this. (You may want
> to use the logging API of FreeMarker.)
>
> > Thank you !
>
> --
> Thanks,
>  Daniel Dekany
>
>
>
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------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and 
their applications. This 200-page book is written by three acclaimed 
leaders in the field. The early access version is available now. 
Download your free book today! http://p.sf.net/sfu/neotech_d2d_may

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