response.sendRedirect报java.lang.IllegalStateException?

在遇到response.sendRedirect("a.jsp")时
如果buffer=128kb(足够大的话),页面不会出错
反之默认,或none则出现java.lang.IllegalStateException

如果没有response.sendRedirect之类的则不论如何都不会出错



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concerning..
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jdk中关于java.lang.IllegalStateException的说明:
Signals that a method has been invoked at an illegal or inappropriate time. In other words, the Java environment or Java application is not in an appropriate state for the requested operation.

哪位给解释一下？
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可能和系统有关系，重装一次！
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