Spark Java : Exception Mapping

You can configure exceptions using Spark.

public class IdMissingException extends Exception{
 IdMissingException(){
  super("Id is missing in request parameter");
 }
}

import static spark.Spark.*;

public class HelloSpark {
 public static void main(String[] args) { 
  
  get("/getDetails", (request, response) -> { 
   String id = request.queryParams("id");
   
   if(id == null)
    throw new IdMissingException();
   
     return "Hello" + id;
  });
  
  exception(IdMissingException.class, (e, request, response) -> {
      response.status(404);
      response.body("Resource not found");
  });  
  
 }

}

Hit URL http://localhost:4567/getDetails.

Response Headers like below.

    Status Code: 404 Not Found

    Content-Length: 18

    Content-Type: text/html; charset=UTF-8

    Server: Jetty(9.0.2.v20130417)

Response body like below.

        Resource not found

Prevoius                                                 Next                                                 Home