调试拦截器出现以下错误：

HTTP Status 500 - javax.servlet.ServletException: java.lang.IllegalStateException: Cannot create a session after the response has been committed

 

type Exception report

message javax.servlet.ServletException: java.lang.IllegalStateException: Cannot create a session after the response has been committed

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.IllegalStateException: Cannot create a session after the response has been committed

	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:601)

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

	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)

	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)

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

	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:160)

	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)

	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1282)

	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)

	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)

	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)

	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

	javax.servlet.http.HttpServlet.service(HttpServlet.java:622)

	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

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

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

	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)

	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause

javax.servlet.ServletException: java.lang.IllegalStateException: Cannot create a session after the response has been committed

	org.apache.jsp.jsp.index_jsp._jspService(index_jsp.java:134)

	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:443)

	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)

	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)

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

	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:160)

	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)

	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1282)

	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)

	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)

	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)

	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

	javax.servlet.http.HttpServlet.service(HttpServlet.java:622)

	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

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

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

	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)

	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause

java.lang.IllegalStateException: Cannot create a session after the response has been committed

	org.apache.catalina.connector.Request.doGetSession(Request.java:2953)

	org.apache.catalina.connector.Request.getSession(Request.java:2367)

	org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:896)

	javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:231)

	org.apache.jasper.runtime.PageContextImpl.initialize(PageContextImpl.java:137)

	org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:109)

	org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:60)

	org.apache.jsp.jsp.index_jsp._jspService(index_jsp.java:100)

	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:443)

	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)

	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)

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

	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:160)

	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)

	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1282)

	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)

	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)

	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)

	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

	javax.servlet.http.HttpServlet.service(HttpServlet.java:622)

	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

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

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

	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)

	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

仔细检查是由于，我在函数preHandle中做了跳转，但返回值确是true.导致的。
    @Override

    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {

        System.out.println("------------------处理前---------------------");

        System.out.println("------------------" + httpServletRequest.getContextPath() + "index.jsp---------------------");

        httpServletResponse.sendRedirect(httpServletRequest.getContextPath() + "/jsp/index.jsp");

        return true;

    }

将返回值改为false，错误消失。

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