fix regression: always display custom error page instead of container…

… error page

src/main/java/alfio/config/SpringBootInitializer.java

@@ -19,12 +19,14 @@
 import com.openhtmltopdf.util.XRLog;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
+import org.springframework.boot.context.embedded.ErrorPage;
 import org.springframework.boot.context.embedded.MimeMappings;
 import org.springframework.boot.context.embedded.ServletContextInitializer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Profile;
 import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.http.HttpStatus;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.filter.CharacterEncodingFilter;
 
@@ -82,7 +84,7 @@ public EmbeddedServletContainerCustomizer embeddedServletContainerCustomizer() {
             container.setSessionTimeout(2, TimeUnit.HOURS);
             container.setMimeMappings(new MimeMappings(mimeMappings));
 
-            //container.addErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/404-not-found"), new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500-internal-server-error"), new ErrorPage("/session-expired"));
+            container.addErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/404-not-found"), new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500-internal-server-error"), new ErrorPage("/session-expired"));
         };
     }
 }