jsp页面报错 HTTP Status 500
HTTP Status 500 - An exception occurred processing JSP page /SearchList.jsp at line 27

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type Exception report

message An exception occurred processing JSP page /SearchList.jsp at line 27

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

exception 

org.apache.jasper.JasperException: An exception occurred processing JSP page /SearchList.jsp at line 27

24: <jsp:useBean id="jBean" class="server.JavaBean"/>
25: <%
26:     String sql="select * from student order by id";
27:     java.util.List list = sBean.getSearch(sql);
28:     for(java.util.Iterator it = list.iterator();it.hasNext();)
29:     {
30:      jBean=(server.JavaBean)it.next();


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)


root cause 

java.lang.NullPointerException
server.SqlBean.getSearch(SqlBean.java:150)
org.apache.jsp.SearchList_jsp._jspService(SearchList_jsp.java:104)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)


note The full stack trace of the root cause is available in the Apache Tomcat/7.0.42 logs.

代码如下：
<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";