diff -r 6385103f622f build.xml
--- a/build.xml	Thu Sep 06 18:39:50 2012 +0900
+++ b/build.xml	Mon Sep 10 14:54:05 2012 +0900
@@ -571,7 +571,8 @@
                source="${jdk.source.version}"
                debug="${debug}"
                deprecation="${deprecation}"
-               nowarn="${nowarn}">
+               nowarn="${nowarn}"
+               encoding="UTF-8">
             <compilerarg line="${javac.Xlint}"/>
             <classpath refid="test.classpath" />
         </javac>