--- akka-2.3.0/build.xml	2020-03-04 10:35:46.635916846 +0100
+++ akka-2.3.0/build.xml	2020-03-04 10:36:37.600162607 +0100
@@ -382,7 +382,7 @@
         includes="**/*.java"
         debug="true"
         classpathref="@{buildclasspath}"
-        target="1.6" source="1.6">
+        target="1.6" source="1.6" encoding="utf-8">
       </javac>
     </sequential>
   </macrodef>