Call error handler for exceptions in UI.init() (#8055)

Fixes #4995

2 files changed, 12 insertions, 2 deletions

diff --git a/uitest/src/main/java/com/vaadin/tests/components/ui/UIInitException.java b/uitest/src/main/java/com/vaadin/tests/components/ui/UIInitException.java
index d5f26ade29..fa25d7e837 100644
--- a/uitest/src/main/java/com/vaadin/tests/components/ui/UIInitException.java
+++ b/uitest/src/main/java/com/vaadin/tests/components/ui/UIInitException.java
@@ -1,12 +1,22 @@
 package com.vaadin.tests.components.ui;
 
+import com.vaadin.server.ErrorHandler;
 import com.vaadin.server.VaadinRequest;
 import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Label;
 
 public class UIInitException extends AbstractTestUI {
 
     @Override
     protected void setup(VaadinRequest request) {
+        setErrorHandler(new ErrorHandler() {
+            @Override
+            public void error(com.vaadin.server.ErrorEvent event) {
+                addComponent(new Label("An exception occurred: "
+                        + event.getThrowable().getMessage()));
+
+            }
+        });
         throw new RuntimeException("Catch me if you can");
     }
 
diff --git a/uitest/src/test/java/com/vaadin/tests/components/ui/UIInitExceptionTest.java b/uitest/src/test/java/com/vaadin/tests/components/ui/UIInitExceptionTest.java
index c1d6aaa55b..064132d4c7 100644
--- a/uitest/src/test/java/com/vaadin/tests/components/ui/UIInitExceptionTest.java
+++ b/uitest/src/test/java/com/vaadin/tests/components/ui/UIInitExceptionTest.java
@@ -3,9 +3,9 @@ package com.vaadin.tests.components.ui;
 import org.junit.Assert;
 import org.junit.Test;
 
-import com.vaadin.tests.tb3.MultiBrowserTest;
+import com.vaadin.tests.tb3.SingleBrowserTest;
 
-public class UIInitExceptionTest extends MultiBrowserTest {
+public class UIInitExceptionTest extends SingleBrowserTest {
     @Test
     public void testExceptionOnUIInit() throws Exception {
         openTestURL();