[stringtemplate-interest] Template validation

[Ilya Sterin]

Is there a way to validate a template synchronously.   I see there is
a StringTemplateErrorListener which allows to listen to an error
event, but it doesn't fit very well into my current model.  We
basically have a factory which generates templates by retrieving them
from storage (these templates are user defined) and then we construct
a StringTemplate using the text.  Currently, no exception is thrown
and StringTemplate logs parsing errors

action parse error; template context is [anonymous
if(isIntervalFull)_subtemplate]
line 1:1: unexpected token: Congrats
at org.antlr.stringtemplate.language.ActionParser.primaryExpr(ActionParser.java:813)
at org.antlr.stringtemplate.language.ActionParser.expr(ActionParser.java:539)
...

Is there a way to either force the parser to throw an exception and/or
is there a way to validate the template text synchronously?

Thanks.

--Ilya