--- a/langtools/src/share/classes/com/sun/tools/javadoc/AnnotationDescImpl.java	Tue Sep 08 13:53:10 2009 -0700
+++ b/langtools/src/share/classes/com/sun/tools/javadoc/AnnotationDescImpl.java	Tue Sep 08 14:08:26 2009 -0700
@@ -60,7 +60,12 @@
      */
     public AnnotationTypeDoc annotationType() {
         ClassSymbol atsym = (ClassSymbol)annotation.type.tsym;
-        return (AnnotationTypeDoc)env.getClassDoc(atsym);
+        if (annotation.type.isErroneous()) {
+            env.warning(null, "javadoc.class_not_found", annotation.type.toString());
+            return new AnnotationTypeDocImpl(env, atsym);
+        } else {
+            return (AnnotationTypeDoc)env.getClassDoc(atsym);
+        }
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javadoc/annotations/missing/Main.java	Tue Sep 08 14:08:26 2009 -0700
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2009 Google, 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 6709246
+ * @summary Class-cast exception when annotation type is missing.
+ * @library ../../lib
+ */
+
+import java.io.IOException;
+import com.sun.javadoc.RootDoc;
+import com.sun.javadoc.ClassDoc;
+import com.sun.javadoc.AnnotationDesc;
+
+public class Main extends Tester.Doclet {
+
+    private static final Tester tester = new Tester("Main", "somepackage");
+
+    public static void main(String... args) throws Exception {
+        tester.run();
+    }
+
+    public static boolean start(RootDoc root) {
+        for (ClassDoc d : root.classes()) {
+            for (AnnotationDesc a : d.annotations()) {
+                System.out.println(a.annotationType());
+            }
+        }
+        return true;
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javadoc/annotations/missing/somepackage/MissingAnnotationClass.java	Tue Sep 08 14:08:26 2009 -0700
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2009 Google, 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.
+ */
+
+package somepackage;
+
+/**
+ * This class has an annotation which is not available.
+ */
+@NoSuchAnnotation
+public class MissingAnnotationClass {
+}