is it possible to set a global branded error page for 404's a using dropwizard - grails

Question

I find myself working a grails application that is being deployed as a fat jar built by a custom plugin that uses dropwizard to configure jetty.
It seems as though dropwizard doesn't allow facilitate the use of a plain old web.xml or jetty.xml and instead everything is set by java config at startup (i.e. using com.yammer.dropwizard.config.Environment).
Am I missing something here? Is there some way to map a 404 back to a URL or any kind of web page I can override so that a Jetty 404 isn't the default.
(yes I'm aware I could do something with the load balancer to redirect 404s)

Answer 1

I dont know how it is in grails, but this helps in java with dropwizard 0.7.1 run() method:
ResourceConfig jrConfig = environment.jersey().getResourceConfig();
environment.jersey().register(new RestErrorsHandler(jrConfig ));
Create this class for the mapping of exceptions -> give back an individual response!
#Provider
public class RestErrorsHandler implements ExceptionMapper<Exception> {
/**
* Deletes all ExpetionMappers.
*
* #param jrConfig
*/
public RestErrorsHandler(
ResourceConfig jrConfig)
{
// Remove all of Dropwizard's custom ExceptionMappers
Set<?> dwSingletons = jrConfig.getSingletons();
List<Object> singletonsToRemove = new ArrayList<Object>();
for (Object s : dwSingletons) {
// Remove all Exception mappers
if (s instanceof ExceptionMapper) {
singletonsToRemove.add(s);
}
}
for (Object s : singletonsToRemove) {
jrConfig.getSingletons().remove(s);
}
}
public Response toResponse(
Exception exception)
{
//Handle different exceptions in another way
if (exception.getClass().equals(JsonParseException.class)){
Response response = RestErrorsHandler.generalResponse(exception);
return response ;
} else if(exception.getClass().equals(JsonParseException.class)){
Response response = RestErrorsHandler.generalResponse(exception);
return response ;
} else if(exception.getClass().equals(Class.class)){
Response response = RestErrorsHandler.generalResponse(exception);
return response ;
}
//genral problem -> output default
Response response = RestErrorsHandler.generalResponse(exception);
return response ;
}
public static Response generalResponse(Exception exception)
{
return Response.status(Status.BAD_REQUEST).type(MediaType.TEXT_PLAIN)
.entity("if you just want to give back a string, but could also be default html page or whatever").build();
}
}