Avoids parsing namespace when using existing namespace

core/src/main/java/com/opensymphony/xwork2/ActionChainResult.java

@@ -201,13 +201,10 @@ public class ActionChainResult implements Result {
      * @param invocation the DefaultActionInvocation calling the action call stack
      */
     public void execute(ActionInvocation invocation) throws Exception {
-        // if the finalNamespace wasn't explicitly defined, assume the current one
-        if (this.namespace == null) {
-            this.namespace = invocation.getProxy().getNamespace();
-        }
-
         ValueStack stack = ActionContext.getContext().getValueStack();
-        String finalNamespace = TextParseUtil.translateVariables(namespace, stack);
+        String finalNamespace = this.namespace != null
+                ? TextParseUtil.translateVariables(namespace, stack)
+                : invocation.getProxy().getNamespace();
         String finalActionName = TextParseUtil.translateVariables(actionName, stack);
         String finalMethodName = this.methodName != null
                 ? TextParseUtil.translateVariables(this.methodName, stack)

core/src/main/java/org/apache/struts2/result/PostbackResult.java

@@ -136,6 +136,7 @@ public class PostbackResult extends StrutsResultSupport {
             actionName = conditionalParse(actionName, invocation);
             if (namespace == null) {
                 namespace = invocation.getProxy().getNamespace();
+                parseLocation = false;
             } else {
                 namespace = conditionalParse(namespace, invocation);
             }

core/src/main/java/org/apache/struts2/result/ServletActionRedirectResult.java

@@ -161,6 +161,7 @@ public class ServletActionRedirectResult extends ServletRedirectResult implement
         actionName = conditionalParse(actionName, invocation);
         if (namespace == null) {
             namespace = invocation.getProxy().getNamespace();
+            parseLocation = false;
         } else {
             namespace = conditionalParse(namespace, invocation);
         }

core/src/main/java/org/apache/struts2/result/StrutsResultSupport.java

@@ -122,6 +122,8 @@ public abstract class StrutsResultSupport implements Result, StrutsStatics {
     /** use UTF-8 as this is the recommended encoding by W3C to avoid incompatibilities. */
     public static final String DEFAULT_URL_ENCODING = "UTF-8";
 
+    protected boolean parseLocation = true;
+
     private boolean parse;
     private boolean encode;
     private String location;
@@ -200,7 +202,7 @@ public abstract class StrutsResultSupport implements Result, StrutsStatics {
      * @throws Exception if an error occurs while executing the result.
      */
     public void execute(ActionInvocation invocation) throws Exception {
-        lastFinalLocation = conditionalParse(location, invocation);
+        lastFinalLocation = parseLocation ? conditionalParse(location, invocation) : location;
         doExecute(lastFinalLocation, invocation);
     }
 

plugins/portlet/src/main/java/org/apache/struts2/portlet/result/PortletActionRedirectResult.java

@@ -179,6 +179,7 @@ public class PortletActionRedirectResult extends PortletResult {
 		}
 		if (namespace == null) {
 			namespace = invocation.getProxy().getNamespace();
+			parseLocation = false;
 		} else {
 			namespace = conditionalParse(namespace, invocation);
 		}