diff -r 6517bf8e50d0 -r c46e0c9940d6 src/share/classes/com/sun/tools/doclets/internal/toolkit/builders/AnnotationTypeBuilder.java
--- a/src/share/classes/com/sun/tools/doclets/internal/toolkit/builders/AnnotationTypeBuilder.java	Wed Oct 10 18:34:46 2012 -0700
+++ b/src/share/classes/com/sun/tools/doclets/internal/toolkit/builders/AnnotationTypeBuilder.java	Wed Oct 10 18:44:21 2012 -0700
@@ -179,7 +179,7 @@
      * @param annotationInfoTree the content tree to which the documentation will be added
      */
     public void buildAnnotationTypeSignature(XMLNode node, Content annotationInfoTree) {
-        StringBuffer modifiers = new StringBuffer(
+        StringBuilder modifiers = new StringBuilder(
                 annotationTypeDoc.modifiers() + " ");
         writer.addAnnotationTypeSignature(Util.replaceText(
                 modifiers.toString(), "interface", "@interface"), annotationInfoTree);