java.lang.IllegalStateException: getOutputStream() has already been call

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本文介绍了一种常见的404页面错误——非法状态异常:getOutputStream()已调用。通过在404.jsp页面末尾加入特定的JSP代码，可以有效避免此错误的发生。

java.lang.IllegalStateException: getOutputStream() has already been call

好郁闷的错误啊。

网上有很多说法。。

看看这个解决方法：

http://www.java1995.cn/article/941.html

Caused by: java.lang.IllegalStateException: getOutputStream() has already been called for this response
	at org.apache.catalina.connector.Response.getWriter(Response.java:604)
	at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
	at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)
	at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)
	at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:186)
	at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:118)
	at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:77)
	at org.apache.jsp.errors._404_jsp._jspService(_404_jsp.java:98)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
	... 19 more

在所报错的页面的最尾部加上<%out.clear();
out = pageContext.pushBody();%>，

根据上面的错误信息在404.jsp页面的最后面 </html>标签后加上<%out.clear();
out = pageContext.pushBody();%>就不会再有这个错误了。