--- a/langtools/src/share/classes/com/sun/tools/javac/comp/Resolve.java	Tue Mar 06 13:29:45 2012 +0000
+++ b/langtools/src/share/classes/com/sun/tools/javac/comp/Resolve.java	Tue Mar 06 16:48:29 2012 +0000
@@ -2097,9 +2097,10 @@
  *  ResolveError classes, indicating error situations when accessing symbols
  ****************************************************************************/
 
-    public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) {
-        AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym);
-        logResolveError(error, tree.pos(), type.getEnclosingType().tsym, type.getEnclosingType(), null, null, null);
+    //used by TransTypes when checking target type of synthetic cast
+    public void logAccessErrorInternal(Env<AttrContext> env, JCTree tree, Type type) {
+        AccessError error = new AccessError(env, env.enclClass.type, type.tsym);
+        logResolveError(error, tree.pos(), env.enclClass.sym, env.enclClass.type, null, null, null);
     }
     //where
     private void logResolveError(ResolveError error,

--- a/langtools/src/share/classes/com/sun/tools/javac/comp/TransTypes.java	Tue Mar 06 13:29:45 2012 +0000
+++ b/langtools/src/share/classes/com/sun/tools/javac/comp/TransTypes.java	Tue Mar 06 16:48:29 2012 +0000
@@ -107,7 +107,7 @@
         make.at(tree.pos);
         if (!types.isSameType(tree.type, target)) {
             if (!resolve.isAccessible(env, target.tsym))
-                resolve.logAccessError(env, tree, target);
+                resolve.logAccessErrorInternal(env, tree, target);
             tree = make.TypeCast(make.Type(target), tree).setType(target);
         }
         make.pos = oldpos;

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/generics/7151070/T7151070.java	Tue Mar 06 16:48:29 2012 +0000
@@ -0,0 +1,25 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug     7151070
+ * @summary NullPointerException in Resolve.isAccessible
+ * @compile/fail/ref=T7151070.out -XDrawDiagnostics T7151070.java
+ */
+
+class T7151070a {
+    private static class PrivateCls { }
+    public static class PublicCls extends PrivateCls { }
+
+    public void m(PrivateCls p) { }
+}
+
+class T7151070b {
+    public void test(Test<T7151070a.PublicCls> obj, T7151070a outer) {
+        outer.m(obj.get());
+    }
+
+    public static class Test<T> {
+        public T get() {
+            return null;
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/generics/7151070/T7151070.out	Tue Mar 06 16:48:29 2012 +0000
@@ -0,0 +1,2 @@
+T7151070.java:17:24: compiler.err.report.access: T7151070a.PrivateCls, private, T7151070a
+1 error