Allow creating session for Portlet UI init request (#12473)

Change-Id: I4c62e246c026cec7c87c2bd5ee5435891f885882

1 files changed, 4 insertions, 0 deletions

diff --git a/server/src/com/vaadin/server/VaadinPortletService.java b/server/src/com/vaadin/server/VaadinPortletService.java
index c7fc5a23bd..194c9c88a9 100644
--- a/server/src/com/vaadin/server/VaadinPortletService.java
+++ b/server/src/com/vaadin/server/VaadinPortletService.java
@@ -201,6 +201,10 @@ public class VaadinPortletService extends VaadinService {
             // been rendered, e.g. portlet on one page sends an event to a
             // portlet on another page and then moves the user to that page.
             return true;
+        } else if (PortletUIInitHandler.isUIInitRequest(request)) {
+            // In some cases, the RenderRequest seems to be cached, causing the
+            // first request be the one triggered by vaadinBootstrap.js.
+            return true;
         }
         return false;
     }