Use getContainer() instead of accessing field directly. Fixes #49.

Author: jcoleman

src/main/java/com/orangefunction/tomcat/redissessions/RedisSessionManager.java

@@ -674,14 +674,14 @@ private void initializeSerializer() throws ClassNotFoundException, IllegalAccess
 
     Loader loader = null;
 
-    if (container != null) {
-      loader = container.getLoader();
+    if (getContainer() != null) {
+      loader = getContainer().getLoader();
     }
 
     ClassLoader classLoader = null;
 
     if (loader != null) {
-        classLoader = loader.getClassLoader();
+      classLoader = loader.getClassLoader();
     }
     serializer.setClassLoader(classLoader);
   }