Thanks 
a) part worked well for me !

apache-10 wrote:
> 
> several possibilities:
> 
> a) You can use the experimental TemplateTool to programmatically get a
> list of references to check against the context before rendering:
>  
> http://svn.apache.org/repos/asf/velocity/engine/trunk/experimental/templatetool/TemplateTool.java
> 
> b) Use an buffering writer and a ReferenceInsertionEventHandler to stop
> rendering if something is missing
> 
> c) Check with #if($!myvar != null) before using reference content (as in
> previous answer to this thread).
> 
> Hope this helps somehow,
> Christoph
> 
> Captain Cid wrote:
>> I have a template containing some variables to be rendered from context.
>> Is there way by which i can know if all the variables are present in the
>> context, otherwise throw an error.
> 
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