--- a/langtools/src/share/classes/com/sun/tools/javac/code/Types.java	Thu Jun 19 23:52:33 2014 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javac/code/Types.java	Fri Jun 20 10:56:31 2014 -0600
@@ -2315,7 +2315,7 @@
             public Type visitType(Type t, Void ignored) {
                 // A note on wildcards: there is no good way to
                 // determine a supertype for a super bounded wildcard.
-                return null;
+                return Type.noType;
             }
 
             @Override
@@ -2482,7 +2482,7 @@
             return false;
         return
             t.isRaw() ||
-            supertype(t) != null && isDerivedRaw(supertype(t)) ||
+            supertype(t) != Type.noType && isDerivedRaw(supertype(t)) ||
             isDerivedRaw(interfaces(t));
     }
 

--- a/langtools/src/share/classes/com/sun/tools/javac/comp/Check.java	Thu Jun 19 23:52:33 2014 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javac/comp/Check.java	Fri Jun 20 10:56:31 2014 -0600
@@ -2684,7 +2684,7 @@
                 checkClassBounds(pos, seensofar, it);
             }
             Type st = types.supertype(type);
-            if (st != null) checkClassBounds(pos, seensofar, st);
+            if (st != Type.noType) checkClassBounds(pos, seensofar, st);
         }
 
     /** Enter interface into into set.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/generics/wildcards/T8034147.java	Fri Jun 20 10:56:31 2014 -0600
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8034147
+ * @summary javac crashes with a NullPointerException during bounds checking
+ * @compile T8034147.java
+ */
+
+class T8034147 {
+    static class One<X extends Two<? super X>> {}
+    static class Two<Y extends Three<? extends Y>> implements Three<Y> {}
+    interface Three<Z> {}
+}