HTTP状态 500 - 内部服务器错误 类型 异常报告 消息 在 [84] 行处理 [/WEB-INF/jsp/user/usermanager.jsp] 时发生异常 描述 服务器遇到一个意外的情况

HTTP状态 500 - 内部服务器错误
类型 异常报告
消息 在 [84] 行处理 [/WEB-INF/jsp/user/usermanager.jsp] 时发生异常
描述 服务器遇到一个意外的情况，阻止它完成请求。
例外情况
org.apache.jasper.JasperException: 在 [84] 行处理 [/WEB-INF/jsp/user/usermanager.jsp] 时发生异常
81:
82:
83:
84: <c:forEach items="$userList.list"var="user">85:<tr>86:<td>${user.id}
87: ${user.name}

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:610)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:499)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:171)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:529)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
根本原因。
java.lang.NumberFormatException: For input string: “list”
java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
java.lang.Integer.parseInt(Integer.java:580)
java.lang.Integer.parseInt(Integer.java:615)
javax.el.ListELResolver.coerce(ListELResolver.java:144)
javax.el.ListELResolver.getValue(ListELResolver.java:64)
org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:125)
org.apache.el.parser.AstValue.getValue(AstValue.java:168)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:690)
org.apache.jsp.WEB_002dINF.jsp.user.usermanager_jsp._jspx_meth_c_005fforEach_005f0(usermanager_jsp.java:482)
org.apache.jsp.WEB_002dINF.jsp.user.usermanager_jsp._jspService(usermanager_jsp.java:212)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:171)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:529)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

根据日志信息来看，出现了一个 HTTP 状态 500 的内部服务器错误。错误发生在处理 /WEB-INF/jsp/user/usermanager.jsp 文件的第 84 行。异常的根本原因是一个 NumberFormatException，输入的字符串 “list” 无法转换为整数。这个异常发生在尝试解析 $userList.list的值时。可能的原因是在JSP文件中，${userList.list} 期望一个整数值作为输入，但实际传入了一个字符串 “list”。你需要检查代码并确保 ${userList.list} 是一个整数值，或者将其修改为正确的值。