diff -r b486794d160d -r 33abf479f202 src/share/classes/com/sun/tools/javac/parser/JavadocTokenizer.java
--- a/src/share/classes/com/sun/tools/javac/parser/JavadocTokenizer.java	Wed Nov 14 16:41:51 2012 -0800
+++ b/src/share/classes/com/sun/tools/javac/parser/JavadocTokenizer.java	Wed Nov 14 17:23:10 2012 -0800
@@ -234,10 +234,12 @@
             // If we find an exact match for pos, the other item in the pair
             // gives the source pos; otherwise, compute the source position
             // relative to the best match found in the array.
+            if (pos == Position.NOPOS)
+                return Position.NOPOS;
             if (pos < 0 || pos >= docComment.length())
-                throw new StringIndexOutOfBoundsException();
+                throw new StringIndexOutOfBoundsException(String.valueOf(pos));
             if (docPosns == null)
-                return -1;
+                return Position.NOPOS;
             int start = 0;
             int end = docPosns.length;
             while (start < end - 2) {