在一个典型的portlet程序中，每一个对服务器的请求都将导致对整个浏览器页面的刷新，这就产生页面的不稳定以及性能缺陷。
In a typical portlet application, each request to the server causes a complete refresh of the browser page, which leads to page flickering and performance gaps.
不适合宿主编程模型，并可能导致服务器进程本身不稳定的方法或类。
Methods or classes that do not fit the host programming model and could lead to a destabilization of the server process itself.
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