From 9c80f02fdf9a95a0c5009d502536ef459753586f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B8=A9=E5=B0=91?= <szujobs@hotmail.com>
Date: Wed, 14 Mar 2012 12:20:03 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=94=B9=E6=B3=A8=E5=86=8C=E7=AD=96?=
 =?UTF-8?q?=E7=95=A5?=
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---
 .../com/alibaba/druid/stat/DruidDataSourceStatManager.java  | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java b/src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java
index e451f9a398..5af1288140 100644
--- a/src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java
+++ b/src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java
@@ -60,7 +60,11 @@ public class DruidDataSourceStatManager implements DruidDataSourceStatManagerMBe
         MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();
         if (dataSources.size() == 0) {
             try {
-                mbeanServer.registerMBean(instance, new ObjectName(MBEAN_NAME));
+                
+                ObjectName objectName = new ObjectName(MBEAN_NAME);
+                if (!mbeanServer.isRegistered(objectName)) {
+                    mbeanServer.registerMBean(instance, objectName);
+                }
             } catch (JMException ex) {
                 LOG.error("register mbean error", ex);
             }