src/share/classes/java/io/SerialCallbackContext.java

@@ -58,11 +58,11 @@
 
     public ObjectStreamClass getDesc() {
         return desc;
     }
 
-    private void checkAndSetUsed() throws NotActiveException {
+    public void checkAndSetUsed() throws NotActiveException {
         if (thread != Thread.currentThread()) {
              throw new NotActiveException(
               "not in readObject invocation or fields already read");
         }
         thread = null;