java ee 6 - What's difference between `javax.servlet.AsyncContext.startAsync()` and `new Thread(Runnable).start()`? -

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i have read article 17.12 asynchronous processing

what difference between:

public void doget(httpservletrequest req, httpservletresponse resp) {     asynccontext acontext = req.startasync();     ... }

and 

public void doget(httpservletrequest req, httpservletresponse resp) {    runnable runnable = ...    new thread(runnable).start();    ... }

the difference lies in 'who' controlling thread. when asynccontext request, use start method , pass instance of runnable, container manages thread in executes logic passed in runnable instance. not case when fire thread using new thread(runnable).start()


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