firstly ,it's my code ,and setuptopic() and disconnectAndDestroyAllNotificationReceivers() will be invoked by another Jmx: MBean .connect() and disconnect() seperately.
in another word ,I will invoke these two methods by Jmx Manage Bean .

public void setupTopic() throws JMSException, NamingException {


 iniCtx = new InitialContext();
 Object tmp = iniCtx.lookup("ConnectionFactory");
 String alarmTopicName ="topic/ALARMNOTIFICATIONS";
 String connectStatusTopicName ="topic/OSNOTIFICATIONS";
 TopicConnectionFactory tcf = (TopicConnectionFactory) tmp;
 //topic = (Topic) iniCtx.lookup(alarmTopicName);
 topic2 = (Topic) iniCtx.lookup(connectStatusTopicName);
 conn = tcf.createTopicConnection();
 session = conn.createTopicSession(false, TopicSession.AUTO_ACKNOWLEDGE);
 conn.start();
 connectHealthReceiver();

 }

public void disconnectAndDestroyAllNotificationReceivers() {
 try {
 //topicSubscriber.setMessageListener(null);
 session.close();
 conn.stop();

 iniCtx = null;
 conn = null;
 session = null;
 topic = null;
 topic2 = null;
 System.gc();
 } catch (Exception e) {
 e.printStackTrace();
 }
 }

then please care the following diagram:

[img]http://vip.sina.com.cn/cgi-bin/album/ualimage.cgi?egp=nq7sGp139DGG99GG3vRGvmCCsszmG9mfs9k&al=0&ph=14&brev=0[/img]
once I disconnect and then connect again.(invoke setupTopic)
the following threads will be added .(of courese ,#n will keep increasing).
but after I disconnect ,all these threads never be released(disappear),

Thread[UIL2.SocketManager.ReadTask#9 client=192.168.71.73:xxxx](Running)
Thread[UIL2.SocketManager.ReadTask#10 client=192.168.71.73:xxxx](Running)
Thread[UIL2.SocketManager.ReadTask#11 client=192.168.71.73:xxxx](Running)
Thread[UIL2.SocketManager.ReadTask#12 client=192.168.71.73:xxxx](Running)

I am worried this will impact on the performance of Jboss.
I want to learn what 's those threads ,
how to get rid of them after I disconnect from Jms.

the following threads will be released by jboss and disappear.
name like

Thread[UIL2.SocketManager.MsgPool@xxxx)#1]