[stringtemplate-interest] How to detect if there's an error in a template

[Terence Parr]

Hi Lon, that is very strange. Perhaps i messed up and I ignore the  
template's listener and go straight for the listener of the group. try  
setting the listener of the group you're using even if it's the  
default group.
Thanks,
Ter
On Apr 8, 2009, at 1:47 PM, Lon Varscsak wrote:

> We have a system that uses StringTemplate to merge templates that  
> are created and stored in a database by different users.  It works  
> great, I love StringTemplate. :)
>
> However, I'd like to write a little interface that can "validate"  
> the template to at least ensure that it's not going to throw errors  
> when this template makes it into production.  StringTemplate prints  
> out these wonderful exceptions that I can't figure out how to trap.
>
> When I do:
>
> StringTemplate template = new StringTempate(myDatabaseTemplate);
>
> and have a myDatabaseTemplate that is malformed, a bunch of  
> exceptions are being printed to the output, but they are not being  
> thrown in a way I can catch them.
>
> I've tried creating a StringTemplateErrorListner object and it never  
> reaches my object:
>
> StringTemplate messageTemplate = new StringTemplate();
> ErrorListener errorListener = new ErrorListener(); //this implements  
> StringTemplateErrorListener
>         	
> messageTemplate.setErrorListener(errorListener);
> messageTemplate.setTemplate(messageToTest); //ErrorListener doesn't  
> get stuff called, but errors are printed out.
>
> I would expect my ErrorListener object to be getting "error" or  
> "warning" called, but it doesn't.
>
> Is there anyway to "validate" a template (this template is a String  
> in memory)?
>
> Thanks,
>
> Lon
>
> P.S. -- This is using Java 1.5, and StringTemplate 3.2
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