--- old/src/jdk.jvmstat/share/classes/sun/tools/jstatd/RemoteHostImpl.java	2014-08-27 22:10:00.000000000 +0800
+++ new/src/jdk.jvmstat/share/classes/sun/tools/jstatd/RemoteHostImpl.java	2014-08-27 22:10:00.000000000 +0800
@@ -68,7 +68,7 @@
 
         sb.append("local://").append(lvmid).append("@localhost");
         if (mode != null) {
-            sb.append("?mode=" + mode);
+            sb.append("?mode=").append(mode);
         }
 
         String vmidStr = sb.toString();