--- a/java/org/apache/catalina/core/StandardWrapper.java	
+++ a/java/org/apache/catalina/core/StandardWrapper.java	
@@ -1115,10 +1115,9 @@ public class StandardWrapper extends ContainerBase
 
             classLoadTime=(int) (System.currentTimeMillis() -t1);
 
-            initServlet(servlet);
-
-            // Register our newly initialized instance
             singleThreadModel = servlet instanceof SingleThreadModel;
+            initServlet(servlet, singleThreadModel);
+            // Register our newly initialized instance
             if (singleThreadModel) {
                 if (instancePool == null)
                     instancePool = new Stack<Servlet>();
@@ -1182,11 +1181,15 @@ public class StandardWrapper extends ContainerBase
                     new ServletSecurityElement(secAnnotation));
         }
     }
+    
+    private void initServlet(Servlet servlet) throws ServletException {
+    	initServlet(servlet, false);
+    }
 
-    private synchronized void initServlet(Servlet servlet)
+    private synchronized void initServlet(Servlet servlet, boolean force)
             throws ServletException {
         
-        if (instanceInitialized) return;
+        if (instanceInitialized && !force) return;
 
         // Call the initialization method of this servlet
         try {