求助各位大神，小弟真的无力解决。
系统表现可以打开登录界面，但是输入账户密码无法登录。系统显示tomcat服务正常运行
2019-11-21 8:04:23 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
java.lang.IllegalStateException: Cannot create a session after the response has been committed
at org.apache.catalina.connector.Request.doGetSession(Request.java:2437)
at org.apache.catalina.connector.Request.getSession(Request.java:2157)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:833)
at com.redmoon.oa.pvg.Privilege.getUser(Privilege.java:304)
at com.redmoon.oa.flow.WorkflowDb.display(WorkflowDb.java:2806)
at org.apache.jsp.desktop_jsp._jspService(desktop_jsp.java:394)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.cloudwebsoft.framework.security.ProtectFilter.doFilter(ProtectFilter.java:61)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.redmoon.oa.DownloadFilter.doFilter(DownloadFilter.java:131)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:617)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1774)
at java.lang.Thread.run(Thread.java:619)
2019-11-21 8:43:44 org.apache.catalina.core.StandardWrapperValve invoke
系统具体的现象是什么？是tomcat挂掉了，还是接口调不通？仔细检查下是不是代码设计的不合理导致的，比如jvm内存溢出、
session失效等等
: Cannot create a session after the response has been committed，这可能是session没法创建的原因，你看下jsp里面会话session的保存时间，
百度上大致的回复都是这个 https://blog.csdn.net/c5153000/article/details/7280125