src/java.base/share/classes/sun/reflect/generics/repository/ClassRepository.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -41,11 +41,11 @@
 public class ClassRepository extends GenericDeclRepository<ClassSignature> {
 
     public static final ClassRepository NONE = ClassRepository.make("Ljava/lang/Object;", null);
 
     private Type superclass; // caches the generic superclass info
-    private Type[] superInterfaces; // caches the generic superinterface info
+    private volatile Type[] superInterfaces; // caches the generic superinterface info
 
  // private, to enforce use of static factory
     private ClassRepository(String rawSig, GenericsFactory f) {
         super(rawSig, f);
     }

@@ -89,22 +89,23 @@
             }
         return superclass; // return cached result
     }
 
     public Type[] getSuperInterfaces(){
-        if (superInterfaces == null) { // lazily initialize super interfaces
+        Type[] sis = superInterfaces;
+        if (sis == null) { // lazily initialize super interfaces
             // first, extract super interface subtree(s) from AST
             TypeTree[] ts  = getTree().getSuperInterfaces();
             // create array to store reified subtree(s)
-            Type[] sis = new Type[ts.length];
+            sis = new Type[ts.length];
             // reify all subtrees
             for (int i = 0; i < ts.length; i++) {
                 Reifier r = getReifier(); // obtain visitor
                 ts[i].accept(r);// reify subtree
                 // extract result from visitor and store it
                 sis[i] = r.getResult();
             }
             superInterfaces = sis; // cache overall result
         }
-        return superInterfaces.clone(); // return cached result
+        return sis.clone(); // return cached result
     }
 }