java - Spring Boot Content Negotiating ViewResolver -

i'm working on spring boot project lists users in table, can create .pdf itext.

when try hit unknown endpoint such as:

http://localhost:8080/blablabla , browser tries download blank page(blablabla) instead of showing whitelabel error page(404).

http://localhost:8080/admin/protected_path , browser tries download blank page (protected_path) instead of showing whitelabel error page(403).

http://localhost:8080/login (mapped loginpage.jsp) opens correctly(without trying download blank page)

http://localhost:8080/downloadpdf opens correctly, downloads desired pdf our local machine.

how should configure webconfig display white label error pages correctly(without trying download endpoint) ?

import org.springframework.context.annotation.bean; import org.springframework.context.annotation.configuration; import org.springframework.http.mediatype; import org.springframework.web.accept.contentnegotiationmanager; import org.springframework.web.servlet.viewresolver; import org.springframework.web.servlet.config.annotation.contentnegotiationconfigurer; import org.springframework.web.servlet.config.annotation.defaultservlethandlerconfigurer; import org.springframework.web.servlet.config.annotation.webmvcconfigureradapter; import org.springframework.web.servlet.view.contentnegotiatingviewresolver; import org.springframework.web.servlet.view.internalresourceviewresolver; import org.springframework.web.servlet.view.jstlview;  import java.util.arraylist; import java.util.list;  /**  * @author skylifee7 on 25/07/2017.  */ @configuration public class webconfig extends webmvcconfigureradapter {      @override     public void configurecontentnegotiation(contentnegotiationconfigurer configurer) {         configurer                  .favorpathextention(true)                 .ignoreacceptheader(true)                 .defaultcontenttype(mediatype.text_html); //does not work.     }      @override     public void configuredefaultservlethandling(             defaultservlethandlerconfigurer configurer) {         configurer.enable();     }      /*      * configure contentnegotiatingviewresolver      */     @bean     public viewresolver contentnegotiatingviewresolver(contentnegotiationmanager manager) {         contentnegotiatingviewresolver resolver = new contentnegotiatingviewresolver();         resolver.setcontentnegotiationmanager(manager);          // define possible view resolvers         list<viewresolver> resolvers = new arraylist<>();         resolvers.add(pdfviewresolver());         resolvers.add(internalresourceviewresolver());          resolver.setviewresolvers(resolvers);         return resolver;     }      /*      * configure view resolver provide pdf output using itext library      * generate pdf output object content      */     @bean     public viewresolver pdfviewresolver() {         return new pdfviewresolver();     }      @bean     public viewresolver internalresourceviewresolver() {         internalresourceviewresolver bean = new internalresourceviewresolver();         bean.setviewclass(jstlview.class);         bean.setprefix("/");         bean.setsuffix(".jsp");         return bean;     } } 

update: have done trick workaround weird issue. have created custom error pages .jsp (actually pure html) files , wrote extension spring's errorviewresolver class.

    @controlleradvice public class myerrorviewresolver implements errorviewresolver {      @override     public modelandview resolveerrorview(httpservletrequest request,                                          httpstatus status, map<string, object> model) {         // use request or status optionally return modelandview         modelandview modelandview = new modelandview();          if (status.is4xxclienterror()) {             if (status.value() == 404) {                 modelandview.setviewname("error404");             }         }          return modelandview;      }  }