--- a/langtools/src/share/classes/com/sun/tools/javac/code/Symbol.java	Wed Sep 01 03:19:16 2010 -0700
+++ b/langtools/src/share/classes/com/sun/tools/javac/code/Symbol.java	Thu Sep 02 23:10:05 2010 +0530
@@ -579,6 +579,9 @@
 
         public java.util.List<Symbol> getEnclosedElements() {
             List<Symbol> list = List.nil();
+            if (kind == TYP && type.tag == TYPEVAR) {
+                return list;
+            }
             for (Scope.Entry e = members().elems; e != null; e = e.sibling) {
                 if (e.sym != null && (e.sym.flags() & SYNTHETIC) == 0 && e.sym.owner == this)
                     list = list.prepend(e.sym);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/T6458749.java	Thu Sep 02 23:10:05 2010 +0530
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2010, 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 6458749
+ * @summary  TypeParameterElement.getEnclosedElements() throws NPE within javac
+ * @build T6458749
+ * @compile -processor T6458749 -proc:only T6458749.java
+ */
+
+import java.util.Set;
+import javax.annotation.processing.*;
+import javax.lang.model.element.*;
+import javax.lang.model.util.ElementFilter;
+import javax.lang.model.SourceVersion;
+
+@SupportedAnnotationTypes("*")
+public class T6458749<T> extends AbstractProcessor {
+    public boolean process(Set<? extends TypeElement> tes, RoundEnvironment renv) {
+        if (!renv.processingOver()) {
+            for(TypeElement e : ElementFilter.typesIn(renv.getRootElements())) {
+                System.out.printf("Element %s:%n", e.toString());
+                try {
+                    for (TypeParameterElement tp : e.getTypeParameters()) {
+                        System.out.printf("Type param %s", tp.toString());
+                        if (! tp.getEnclosedElements().isEmpty()) {
+                            throw new AssertionError("TypeParameterElement.getEnclosedElements() should return empty list");
+                        }
+                    }
+                } catch (NullPointerException npe) {
+                    throw new AssertionError("NPE from TypeParameterElement.getEnclosedElements()", npe);
+                }
+            }
+        }
+        return true;
+    }
+
+    public SourceVersion getSupportedSourceVersion() {
+        return SourceVersion.latest();
+    }
+}