--- a/java/build.common.xml	Fri Jun 15 21:52:34 2018 +0100
+++ b/java/build.common.xml	Wed Jul 25 08:23:35 2018 +0000
@@ -50,6 +50,7 @@
     	<mkdir dir="${build.bin.dir}"/>
     	<javac srcdir="${build.src.dir}"
     	       destdir="${build.bin.dir}"
+               encoding="utf-8"
     	       classpathref="build.classpath"
     	       debug="true"
     	       debuglevel="lines,vars,source"
@@ -113,6 +114,7 @@
         <mkdir dir="${build.bin-tests.dir}"/>
         <javac srcdir="${build.src-tests.dir}"
                destdir="${build.bin-tests.dir}"
+               encoding="utf-8"
                classpathref="test.classpath"
                debug="true"
                debuglevel="lines,vars,source"

--- a/tests/java/build.xml	Fri Jun 15 21:52:34 2018 +0100
+++ b/tests/java/build.xml	Wed Jul 25 08:23:35 2018 +0000
@@ -13,6 +13,7 @@
         <mkdir dir="classloader-tests-classes/bin"/>
         <javac srcdir="classloader-tests-classes/src"
                destdir="classloader-tests-classes/bin"
+               encoding="utf-8"
                classpathref="build.classpath"/>
     </target>
     
@@ -24,6 +25,7 @@
             debuglevel="lines,vars,source"
             srcdir="src-tests-INVOKEX"
             destdir="bin-tests-INVOKEX"
+            encoding="utf-8"
             classpathref="build.classpath"/>
 
         <delete>
@@ -38,6 +40,7 @@
             debuglevel="lines,vars,source"
             srcdir="src-tests-INVOKEX-missing-methods"
             destdir="bin-tests-INVOKEX-missing-methods"
+            encoding="utf-8"
             classpathref="build.classpath">
         </javac>
         
@@ -93,4 +96,4 @@
             </batchtest>
         </junit>
     </target>
-</project>
\ No newline at end of file
+</project>