--- opencv-2.4.5/modules/java/build.xml.in~	2013-04-05 12:00:20.000000000 +0300
+++ opencv-2.4.5/modules/java/build.xml.in	2013-06-21 20:08:55.908749180 +0300
@@ -6,7 +6,10 @@
     <!-- This is to make a jar with a source attachment, for e.g. easy -->
     <!-- navigation in Eclipse. See this question: -->
     <!-- http://stackoverflow.com/questions/3584968/ant-how-to-compile-jar-that-includes-source-attachment -->
-    <javac sourcepath="" srcdir="src" destdir="src" debug="on" includeantruntime="false" >
+    <property name="javac.target" value="1.5"/>
+    <property name="javac.source" value="1.5"/>
+
+    <javac sourcepath="" srcdir="src" destdir="src" debug="on" includeantruntime="false" target="${javac.target}" source="${javac.source}">
       <include name="**/*.java"/>
       <compilerarg line="-encoding utf-8"/>
     </javac>