java.io.IOException: Error: JSP Buffer overflow

• 错误

jsp页面报错如下：

 Stacktrace:

     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)

     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)

     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

     org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

     org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)

     org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)

     org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)

     org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)

     org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)

     org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)

     org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:648)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

     org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

     com.tera.sys.filter.AccessFilter.doFilter(AccessFilter.java:80)

     org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

     org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

     org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)

     org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

 root cause

 java.io.IOException: Error: JSP Buffer overflow

     org.apache.jasper.runtime.JspWriterImpl.bufferOverflow(JspWriterImpl.java:158)

     org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:328)

     java.io.Writer.write(Writer.java:157)

     org.apache.jsp.WEB_002dINF.jsp.erule.manage.rulelHis.compareRule_jsp._jspx_meth_c_005fif_005f5(compareRule_jsp.java:428)

     org.apache.jsp.WEB_002dINF.jsp.erule.manage.rulelHis.compareRule_jsp._jspService(compareRule_jsp.java:195)

     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)

     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)

     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

     org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

     org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)

     org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)

     org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)

     org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)

     org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)

     org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)

     org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:648)

     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

     org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

     com.tera.sys.filter.AccessFilter.doFilter(AccessFilter.java:80)

     org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

     org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

     org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)

     org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

 note

• 分析

jsp页面报错，后台往前台输出的数据量小的时候不报错，数据量大的时候报错。这时突然想起来有一为了处理缓存问题，在jsp页面加了设置（最后缓存问题通过其他方式解决了，这个属性也没删，就留了下来）如下图。

• 解决办法

1. 是去掉该属性
2. 也可以增加新属性（buffer=”300kb”）设置缓存大小（不推荐，后台数据是动态的，不能确定大小）

　　　　<%@ page contentType=”text/html;charset=UTF-8″ autoFlush=”false” buffer=”300kb”%>

• 总结

autoFlush属性用来指定缓冲区是否自动进行强制输出。如果设置为true，那么当缓冲区满的时候仍然能够输出正常；如果设置为false，那么当缓冲区满的时候，将会产生异常。默认为true。