SOAP is right choice?

A system just like stock quota has many client(100 000+).
we choose JMS to resolve the project. we have many choice in the field of Client.
1st:Client is a stand-alone application,which directly connect to JMS server and
receive those message.
2nd:using signed applet as JMS Client because of the java property used by WLS,so,in
this way,a dialog will be poped in web browser.i don't think this is a good idea.
3rd:using servlet as JMS Client,but in this way,many things will be done by server
4th:wrapping JMS receiver by SOAP(webservice),in this way,i found WLS 7.0withsp2
hasn't good performance.When connection number increase,client will got error
message,such as,Exception in handleresponse(),connection time out......
Model is that:
per Thread simulate a user,
Using "new Thread().start()",and after this,"Thread.sleep(500)",then "new Thread().start()"
anyone can give me an advance?

ADF works fine for your use case. You can build components for your Model from web services and expose those components in a Data Control. Then in your ViewController, you can drag items from the Data Control to use on your web pages. Here is a tutorial from OTN:
http://www.oracle.com/technology/obe/obe11jdev/11/wsdc/wsdc.htm
Here is a blog entry about this capability, with links to more information:
http://blogs.oracle.com/shay/2009/09/web_services_with_complex_data.html

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