Allow multiple backend languages.

build.xml

@@ -29,6 +29,7 @@
   <property name="test.target.dir" value="${build.dir}/tests"/>
 
   <property name="source.dir" value="src/"/>
+  <property name="source.dir.java" value="${source.dir}/java"/>
   <property name="target.dir" value="${build.dir}/${app.name}/WEB-INF/classes"/>
 
   <property prefix="compile" file="${ant.conf.dir}/compile.properties"/>
@@ -113,7 +114,7 @@
 
   <target name="compile.server" depends="ivy.resolve.compile" description="Compile server source files">
     <mkdir dir="${target.dir}"/>
-	<javac srcdir="${source.dir}"
+	<javac srcdir="${source.dir.java}"
            verbose="${compile.verbose}"
 		   destdir="${target.dir}"
 		   debug="${compile.debug}" 
@@ -190,7 +191,8 @@
 	<delete dir="${build.dir}" />
   </target>
 
-  <target name="clean.full" depends="clean" description="Delete build files and dependencies">
+  <target name="clean.full" depends="clean"
+          description="Delete build files and dependencies">
 	<delete dir="${ivy.jar}"/>
     <delete dir="${lib.dir}"/>
     <ivy:cleancache/>