diff -r 7df1ecd5eadb -r 73af8b6fb8bc langtools/src/share/classes/com/sun/tools/javac/util/RawDiagnosticFormatter.java
--- a/langtools/src/share/classes/com/sun/tools/javac/util/RawDiagnosticFormatter.java	Wed Sep 23 18:29:41 2009 -0700
+++ b/langtools/src/share/classes/com/sun/tools/javac/util/RawDiagnosticFormatter.java	Wed Sep 23 18:48:13 2009 -0700
@@ -30,6 +30,7 @@
 
 import com.sun.tools.javac.api.DiagnosticFormatter.Configuration.*;
 import com.sun.tools.javac.api.Formattable;
+import com.sun.tools.javac.file.BaseFileObject;
 import com.sun.tools.javac.util.AbstractDiagnosticFormatter.SimpleConfiguration;
 
 import static com.sun.tools.javac.api.DiagnosticFormatter.PositionKind.*;
@@ -109,6 +110,8 @@
         String s;
         if (arg instanceof Formattable)
             s = arg.toString();
+        else if (arg instanceof BaseFileObject)
+            s = ((BaseFileObject) arg).getShortName();
         else
             s = super.formatArgument(diag, arg, null);
         if (arg instanceof JCDiagnostic)