From 43405cda89313078d11c0aa1ab4dc5645fb32ff5 Mon Sep 17 00:00:00 2001
From: wenshao <szujobs@hotmail.com>
Date: Sat, 10 Sep 2011 18:25:00 +0000
Subject: [PATCH] bug fixed

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@725 b9813039-fb51-4c41-a8b9-e21c2acb5095
---
 .../com/alibaba/druid/stat/DruidDataSourceStatManager.java    | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java b/src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java
index 09d719d3cd..fb751e9307 100644
--- a/src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java
+++ b/src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java
@@ -77,6 +77,10 @@ public class DruidDataSourceStatManager implements DruidDataSourceStatManagerMBe
 
     public synchronized static void remove(DruidDataSource dataSource) {
         ObjectName objectName = dataSources.remove(dataSource);
+        
+        if (objectName == null) {
+            return;
+        }
 
         MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();