[antlr-interest] How do I throw exception on ERROR "no viable alternative at character "

[Bharath R]

Hi All ,
 
Currentl when I parse my String , I am getting some errors printed in the
console. 
 
Like below : - 
 
line 1:6 no viable alternative at character '?'
line 1:6 no viable alternative at character ' '
 
and for the other characters also ( '@' ,',' ) 
 
Instead of having the System.err , I need the parser to through the
exception. 
 
How Should I achieve this ?? 
 

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