Index: units/helpers/minifiers/minify_helper.php
===================================================================
--- units/helpers/minifiers/minify_helper.php	(revision 13756)
+++ units/helpers/minifiers/minify_helper.php	(working copy)
@@ -199,6 +199,23 @@
 		 */
 		function compressString(&$string, $extension)
 		{
+			$tmp_file = tempnam('/tmp', 'to_compress_');
+			$fp = fopen($tmp_file, 'w');
+			fwrite($fp, $string);
+			fclose($fp);
+
+			$command = 'java -jar ' . dirname(__FILE__) . DIRECTORY_SEPARATOR . 'yuicompressor-2.4.2.jar --type ' . $extension . ' --charset utf-8 ' . $tmp_file;
+			$compressed_string = shell_exec($command);
+
+			unlink($tmp_file);
+
+			if (!is_null($compressed_string)) {
+				$string = $compressed_string;
+				return ;
+			}
+
+			// failed to compress using YUICompressor (maybe java not installed)
+
 			if ($extension == 'js') {
 				$minifier =& $this->Application->makeClass('JsMinifyHelper');
 				/* @var $minifier JsMinifyHelper */