From 095960b5691d33f127000794b3e79638cf384652 Mon Sep 17 00:00:00 2001
From: Lukasz Lenart <lukaszlenart@apache.org>
Date: Mon, 23 May 2016 17:04:38 +0200
Subject: [PATCH] Allows empty string as a action name

---
 .../apache/struts2/dispatcher/mapper/DefaultActionMapper.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/main/java/org/apache/struts2/dispatcher/mapper/DefaultActionMapper.java b/core/src/main/java/org/apache/struts2/dispatcher/mapper/DefaultActionMapper.java
index 1396025fc..005f9f201 100644
--- a/core/src/main/java/org/apache/struts2/dispatcher/mapper/DefaultActionMapper.java
+++ b/core/src/main/java/org/apache/struts2/dispatcher/mapper/DefaultActionMapper.java
@@ -120,7 +120,7 @@ public class DefaultActionMapper implements ActionMapper {
     protected boolean allowSlashesInActionNames = false;
     protected boolean alwaysSelectFullNamespace = false;
     protected PrefixTrie prefixTrie = null;
-    protected Pattern allowedActionNames = Pattern.compile("^[a-zA-Z0-9_!/\\-]+((.htm[l]?)|(.action))?$");
+    protected Pattern allowedActionNames = Pattern.compile("^[a-zA-Z0-9_!/\\-]*((.htm[l]?)|(.action))?$");
     private boolean allowActionPrefix = false;
     private boolean allowActionCrossNamespaceAccess = false;