--- a/jdk/src/java.base/share/classes/java/lang/Class.java	Thu May 08 21:09:57 2014 +0400
+++ b/jdk/src/java.base/share/classes/java/lang/Class.java	Tue Jul 22 16:24:48 2014 +0400
@@ -262,8 +262,8 @@
     @CallerSensitive
     public static Class<?> forName(String className)
                 throws ClassNotFoundException {
-        return forName0(className, true,
-                        ClassLoader.getClassLoader(Reflection.getCallerClass()));
+        Class<?> caller = Reflection.getCallerClass();
+        return forName0(className, true, ClassLoader.getClassLoader(caller), caller);
     }
 
 
@@ -333,22 +333,27 @@
                                    ClassLoader loader)
         throws ClassNotFoundException
     {
-        if (sun.misc.VM.isSystemDomainLoader(loader)) {
-            SecurityManager sm = System.getSecurityManager();
-            if (sm != null) {
-                ClassLoader ccl = ClassLoader.getClassLoader(Reflection.getCallerClass());
+        Class<?> caller = null;
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            // Reflective call to get caller class is only needed if a security manager
+            // is present.  Avoid the overhead of making this call otherwise.
+            caller = Reflection.getCallerClass();
+            if (sun.misc.VM.isSystemDomainLoader(loader)) {
+                ClassLoader ccl = ClassLoader.getClassLoader(caller);
                 if (!sun.misc.VM.isSystemDomainLoader(ccl)) {
                     sm.checkPermission(
                         SecurityConstants.GET_CLASSLOADER_PERMISSION);
                 }
             }
         }
-        return forName0(name, initialize, loader);
+        return forName0(name, initialize, loader, caller);
     }
 
-    /** Called after security checks have been made. */
+    /** Called after security check for system loader access checks have been made. */
     private static native Class<?> forName0(String name, boolean initialize,
-                                            ClassLoader loader)
+                                            ClassLoader loader,
+                                            Class<?> caller)
         throws ClassNotFoundException;
 
     /**