--- a/langtools/src/share/classes/com/sun/tools/javac/util/RichDiagnosticFormatter.java	Wed Jul 15 10:25:01 2009 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javac/util/RichDiagnosticFormatter.java	Wed Jul 15 17:01:47 2009 +0100
@@ -569,7 +569,8 @@
         @Override
         public Void visitMethodSymbol(MethodSymbol s, Void ignored) {
             visit(s.owner, null);
-            typePreprocessor.visit(s.type);
+            if (s.type != null)
+                typePreprocessor.visit(s.type);
             return null;
         }
     };

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/Diagnostics/6860795/T6860795.java	Wed Jul 15 17:01:47 2009 +0100
@@ -0,0 +1,34 @@
+/*
+ * 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     6860795
+ * @summary NullPointerException when compiling a negative java source
+ * @author  mcimadamore
+ * @compile/fail/ref=T6860795.out -XDrawDiagnostics  T6860795.java
+ */
+
+class Test {
+    void foo(float x, int x) {}
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/Diagnostics/6860795/T6860795.out	Wed Jul 15 17:01:47 2009 +0100
@@ -0,0 +1,2 @@
+T6860795.java:33:27: compiler.err.already.defined: x, foo
+1 error