Java servlets - stop executing and redirect on error

Question

I have the following bit of code in my java servlet:

if(passenger == null){
            response.sendError(400, "The specified passenger does not exist.");
        }

The page does redirect to the error page, however, the rest of the servlet code is still executed. How do I redirect and sort of 'break' out of the servlet?

Answer 1

if(passenger == null){
            response.sendError(400, "The specified passenger does not exist.");
    return; //or return null; depending on return type of method
}