Merge pull request #751 from wenshao/master

bug fixed for mbean register

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -1394,8 +1394,12 @@ public class DruidDataSource extends DruidAbstractDataSource
                 public Object run() {
                     ObjectName objectName = DruidDataSourceStatManager.addDataSource(DruidDataSource.this,
                                                                                      DruidDataSource.this.name);
-                    DruidDataSource.this.setObjectName(objectName);
-                    DruidDataSource.this.mbeanRegistered = true;
+                    
+                    if (objectName != null) {
+                        DruidDataSource.this.setObjectName(objectName);
+                        DruidDataSource.this.mbeanRegistered = true;
+                    }
+                    
                     return null;
                 }
             });

src/main/java/com/alibaba/druid/stat/DruidDataSourceStatManager.java

@@ -127,10 +127,19 @@ public class DruidDataSourceStatManager implements DruidDataSourceStatManagerMBe
     }
 
     public synchronized static ObjectName addDataSource(Object dataSource, String name) {
+        if (dataSource == null || name == null) {
+            return null;
+        }
+        
         final IdentityHashMap<Object, ObjectName> instances = getInstances();
-
+        
         synchronized (instances) {
             MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();
+            
+            if (mbeanServer == null) {
+                return null;
+            }
+            
             if (instances.size() == 0) {
                 try {