6864382: NPE in the rich formatter when processing an unattributed type-variable

Summary: Unattributed type variable should not be accessed by the rich formatter when emitting where clauses
Reviewed-by: jjg

src/share/classes/com/sun/tools/javac/util/RichDiagnosticFormatter.java

@@ -524,10 +524,16 @@ public class RichDiagnosticFormatter extends
         @Override
         public Void visitTypeVar(TypeVar t, Void ignored) {
             if (indexOf(t, WhereClauseKind.TYPEVAR) == -1) {
+                //access the bound type and skip error types
                 Type bound = t.bound;
                 while ((bound instanceof ErrorType))
                     bound = ((ErrorType)bound).getOriginalType();
-                List<Type> bounds  = types.getBounds(t);
+                //retrieve the bound list - if the type variable
+                //has not been attributed the bound is not set
+                List<Type> bounds = bound != null ?
+                    types.getBounds(t) :
+                    List.<Type>nil();
+
                 nameSimplifier.addUsage(t.tsym);
 
                 boolean boundErroneous = bounds.head == null ||

test/tools/javac/Diagnostics/6864382/T6864382.java

+/*
+ * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/**
+ * @test
+ * @bug     6864382
+ * @summary NullPointerException when compiling a negative java source
+ * @author  mcimadamore
+ * @compile/fail/ref=T6864382.out -XDrawDiagnostics  T6864382.java
+ */
+
+class T6864382<T> extends T {}

test/tools/javac/Diagnostics/6864382/T6864382.out

+T6864382.java:32:27: compiler.err.type.found.req: (compiler.misc.type.parameter: T), (compiler.misc.type.req.class)
+1 error