feat: add error view

Author: javier-godoy

src/main/java/com/flowingcode/vaadin/addons/errorwindow/ErrorView.java

@@ -0,0 +1,33 @@
+package com.flowingcode.vaadin.addons.errorwindow;
+
+import com.vaadin.flow.component.UI;
+import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+import com.vaadin.flow.router.BeforeEnterEvent;
+import com.vaadin.flow.router.ErrorParameter;
+import com.vaadin.flow.router.HasErrorParameter;
+import com.vaadin.flow.router.internal.DefaultErrorHandler;
+import org.apache.http.HttpStatus;
+
+@SuppressWarnings("serial")
+@DefaultErrorHandler
+public class ErrorView extends VerticalLayout implements HasErrorParameter<Exception> {
+
+  @Override
+  public int setErrorParameter(BeforeEnterEvent event, ErrorParameter<Exception> parameter) {
+    setSizeFull();
+
+    getElement().getThemeList().add("error-window");
+
+    ErrorWindowI18n i18n = ErrorWindowI18n.createDefault();
+    i18n.setClose("Back");
+    new ErrorWindow(parameter.getCaughtException(), i18n) {
+      @Override
+      public void close() {
+        UI.getCurrent().getPage().getHistory().back();
+      }
+    }.getChildren().forEach(this::add);
+
+    return HttpStatus.SC_INTERNAL_SERVER_ERROR;
+  }
+
+}

src/main/java/com/flowingcode/vaadin/addons/errorwindow/VaadinServiceInitListenerImpl.java

@@ -21,9 +21,14 @@
 package com.flowingcode.vaadin.addons.errorwindow;
 
 import com.vaadin.flow.component.UI;
+import com.vaadin.flow.router.InternalServerError;
 import com.vaadin.flow.server.ErrorEvent;
 import com.vaadin.flow.server.ServiceInitEvent;
+import com.vaadin.flow.server.VaadinContext;
+import com.vaadin.flow.server.VaadinService;
 import com.vaadin.flow.server.VaadinServiceInitListener;
+import com.vaadin.flow.server.startup.ApplicationRouteRegistry;
+import java.util.Collections;
 
 public class VaadinServiceInitListenerImpl implements VaadinServiceInitListener {
 
@@ -34,6 +39,17 @@ public void serviceInit(ServiceInitEvent event) {
     event
         .getSource()
         .addSessionInitListener(ev -> ev.getSession().setErrorHandler(this::handleError));
+    registerErrorView(event.getSource());
+  }
+
+  private void registerErrorView(VaadinService source) {
+    VaadinContext context = VaadinService.getCurrent().getContext();
+    ApplicationRouteRegistry registry = ApplicationRouteRegistry.getInstance(context);
+    Class<?> configuredExceptionHandler =
+        registry.getConfiguration().getExceptionHandlerByClass(Exception.class);
+    if (configuredExceptionHandler == InternalServerError.class) {
+      registry.setErrorNavigationTargets(Collections.singleton(ErrorView.class));
+    }
   }
 
   private void handleError(ErrorEvent event) {

src/test/java/com/flowingcode/vaadin/addons/errorwindow/ErrorwindowDemo.java

@@ -20,6 +20,7 @@
 
 package com.flowingcode.vaadin.addons.errorwindow;
 
+import com.vaadin.flow.component.UI;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.checkbox.Checkbox;
 import com.vaadin.flow.component.notification.Notification;
@@ -93,5 +94,8 @@ public ErrorwindowDemo() {
         throwErrorWithoutErrorHandler,
         throwErrorWithCustomMessageAndCustomTexts,
         throwErrorWithCustomMessage);
+
+    add(new Button("Navigation error",
+        ev -> UI.getCurrent().navigate(ThrowInConstructorView.class)));
   }
 }

src/test/java/com/flowingcode/vaadin/addons/errorwindow/ThrowInConstructorView.java

@@ -0,0 +1,13 @@
+package com.flowingcode.vaadin.addons.errorwindow;
+
+import com.vaadin.flow.component.html.Div;
+import com.vaadin.flow.router.Route;
+
+@Route("error-window/throw")
+public class ThrowInConstructorView extends Div {
+
+  public ThrowInConstructorView() {
+    throw new RuntimeException();
+  }
+
+}