STR-3169: Add @throws IllegalStateException

git-svn-id: https://svn.apache.org/repos/asf/struts/struts1/trunk@728477 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/core/src/main/java/org/apache/struts/config/ActionConfigMatcher.java b/core/src/main/java/org/apache/struts/config/ActionConfigMatcher.java
index 5c75b94..fdaf7d0 100755
--- a/core/src/main/java/org/apache/struts/config/ActionConfigMatcher.java
+++ b/core/src/main/java/org/apache/struts/config/ActionConfigMatcher.java
@@ -151,6 +151,8 @@
      * @param vars A Map of wildcard-matched strings
      * @return A cloned ActionConfig with appropriate properties replaced with
      *         wildcard-matched values
+     * @throws IllegalStateException if a placeholder substitution is 
+     * impossible due to recursion
      */
     protected ActionConfig convertActionConfig(String path, ActionConfig orig,
         Map vars) {