HTTP Status 500 问题 求解

提示如下：
type Exception report

message

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

exception

org.apache.jasper.JasperException: String index out of range: -1
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.StringIndexOutOfBoundsException: String index out of range: -1
java.lang.String.substring(String.java:1768)
org.apache.jsp.commend_005fuser.Hotuserlist_jsp._jspService(org.apache.jsp.commend_005fuser.Hotuserlist_jsp:84)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apac

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