Adjusts interceptor

core/src/main/java/org/apache/struts2/dispatcher/HttpParameters.java

@@ -57,15 +57,23 @@ public class HttpParameters implements Cloneable {
         return HttpParameters.createEmpty().withParent(this).withExtraParams(newParams).build();
     }
 
+    public Map<String, String[]> getHttpParameters() {
+        Map<String, String[]> result = new HashMap<>(parameters.size());
+        for (Map.Entry<String, Parameter> entry : parameters.entrySet()) {
+            result.put(entry.getKey(), entry.getValue().getMultipleValue());
+        }
+        return result;
+    }
+
     public static class Builder {
         private Map<String, String[]> requestParameterMap;
         private HttpParameters parent;
 
         protected Builder(Map<String, ?> requestParameterMap) {
-            this.requestParameterMap = toStringArrayMpa(requestParameterMap);
+            this.requestParameterMap = toStringArrayMap(requestParameterMap);
         }
 
-        private Map<String, String[]> toStringArrayMpa(Map<String, ?> map) {
+        private Map<String, String[]> toStringArrayMap(Map<String, ?> map) {
             Map<String, String[]> result = new TreeMap<>();
             for (Map.Entry<String, ?> entry : map.entrySet()) {
                 Object value = entry.getValue();
@@ -94,11 +102,16 @@ public class HttpParameters implements Cloneable {
 
         public Builder withExtraParams(Map<String, ?> params) {
             if (params != null) {
-                requestParameterMap.putAll(toStringArrayMpa(params));
+                requestParameterMap.putAll(toStringArrayMap(params));
             }
             return this;
         }
 
+        public Builder withComparator(Comparator<String> orderedComparator) {
+            requestParameterMap = new TreeMap<>(orderedComparator);
+            return this;
+        }
+
         public HttpParameters build() {
             Map<String, Parameter> parameters = (parent == null)
                     ? new HashMap<String, Parameter>()
@@ -113,10 +126,5 @@ public class HttpParameters implements Cloneable {
             }
             return new HttpParameters(parameters);
         }
-
-        public Builder withComparator(Comparator<String> orderedComparator) {
-            requestParameterMap = new TreeMap<>(orderedComparator);
-            return this;
-        }
     }
 }

core/src/main/java/org/apache/struts2/interceptor/ServletConfigInterceptor.java

@@ -135,7 +135,7 @@ public class ServletConfigInterceptor extends AbstractInterceptor implements Str
         }
 
         if (action instanceof ParameterAware) {
-            ((ParameterAware) action).setParameters((Map)context.getParameters());
+            ((ParameterAware) action).setParameters(context.getParameters().getHttpParameters());
         }
 
         if (action instanceof ApplicationAware) {

core/src/test/java/org/apache/struts2/interceptor/ServletConfigInterceptorTest.java

@@ -30,6 +30,7 @@ import javax.servlet.http.HttpServletResponse;
 
 import org.apache.struts2.StrutsInternalTestCase;
 import org.apache.struts2.StrutsStatics;
+import org.apache.struts2.dispatcher.HttpParameters;
 import org.apache.struts2.util.ServletContextAware;
 import org.easymock.MockControl;
 import org.springframework.mock.web.MockHttpServletRequest;
@@ -89,7 +90,7 @@ public class ServletConfigInterceptorTest extends StrutsInternalTestCase {
         MockActionInvocation mai = createActionInvocation(mock);
 
         Map<String, Object> param = new HashMap<String, Object>();
-        mai.getInvocationContext().setParameters(param);
+        mai.getInvocationContext().setParameters(HttpParameters.createEmpty().build());
 
         mock.setParameters((Map)param);
         control.setVoidCallable();