Fixed TestBench compatibility for root context (#10541)

Change-Id: If400b16afa07480afc8007fd3144f68644a60a12

diff --git a/server/src/com/vaadin/server/VaadinServletService.java b/server/src/com/vaadin/server/VaadinServletService.java
index 7a15c0cc1989471a63cba69e3201daa7a3544b74..55c95f628a81a78108f02a4aaddd17c4dd473e85 100644 (file)
--- a/server/src/com/vaadin/server/VaadinServletService.java
+++ b/server/src/com/vaadin/server/VaadinServletService.java
@@ -205,7 +205,7 @@ public class VaadinServletService extends VaadinService {
             // Just ignore problem here
         }
 
-        if (appId == null || "".equals(appId)) {
+        if (appId == null || "".equals(appId) || "/".equals(appId)) {
             appId = "ROOT";
         }
         appId = appId.replaceAll("[^a-zA-Z0-9]", "");