antlr - Throwing Exception from from ANTLR4 visitor -

i antlr newbie. here grammar trying write visitor class.

grammar extremelysimpleexpr ;  stat : expr ; expr : sub ; sub : add ( '-' add )* ; add : val ( '+' val )*      | val     ;     val : [0-9]+ ; [ \t\n\r]+ -> skip ; 

vistor.java

 .........   public integer vistadd(ctx) {        if (some cond) {           throw new exception()        }   }  .......... 

the problem not able throw exception since generated code not handle exceptions, method signature not have throws exception in signature. there way out of ?

an unchecked exception work, suggested sam harwell - 1 of 2 options - here. tried it.

you can catch exception wherever want.