空指针异常怎么解决呐

<%@ page import="cn.mldn.vo.Member" %>
<%@ page import="cn.mldn.util.StringToDateConverter" %>
<%@ page import="cn.mldn.service.IMemberService" %>
<%@ page import="cn.mldn.factory.ObjectFactory" %>
<%@ page language="java" pageEncoding="UTF-8"%>
<html>
<head>
  <jsp:include page="/pages/plugins/basepath.jsp"/>
  <jsp:include page="/pages/plugins/common.jsp"/>
  <script type="text/javascript" src="js/admin/member/member_add_do.js"></script>
</head>
<body>
<%!
  public static final String MEMBER_ADD_URL = "pages/admin/member/member_add.jsp" ;
%>
<%
  String msg = "用户信息添加失败！" ;
  request.setCharacterEncoding("UTF-8") ;
  Member member = new Member() ; // 实例化VO类的对象
  member.setMid(request.getParameter("mid"));
  member.setName(request.getParameter("name"));
  member.setSex(request.getParameter("sex")) ;
  member.setSalary(Double.parseDouble(request.getParameter("salary")));
  member.setNote(request.getParameter("note"));
  member.setBirthday(StringToDateConverter.converter(request.getParameter("birthday")));
  IMemberService memberService = ObjectFactory.getServiceInstance("member.service", IMemberService.class) ;
  if (memberService.add(member)) {
    msg = "用户信息添加成功！" ;
  }
%>

<div class="row">
  <div class="col-md-12">
    <div class="panel panel-primary">
      <div class="panel-heading">
        <strong><span class="glyphicon glyphicon-user"></span>&nbsp;增加用户信息</strong>
      </div>
      <div class="panel-body" style="height: 80%;">
        <jsp:include page="/pages/plugins/forward.jsp">
          <jsp:param name="msg" value="<%=msg%>"/>
          <jsp:param name="path" value="<%=MEMBER_ADD_URL%>"/>
        </jsp:include>
      </div>
      <div class="panel-footer">
        <jsp:include page="/pages/plugins/footer.jsp"/>
      </div>
    </div>
  </div>
</div>
</body>
</html>

HTTP状态 500 - 内部服务器错误

类型异常报告

消息在 [27] 行处理 [/pages/admin/member/member_add_do.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 [27] 行处理 [/pages/admin/member/member_add_do.jsp] 时发生异常

24:   member.setNote(request.getParameter("note"));
25:   member.setBirthday(StringToDateConverter.converter(request.getParameter("birthday")));
26:   IMemberService memberService = ObjectFactory.getServiceInstance("member.service", IMemberService.class) ;
27:   if (memberService.add(member)) {
28:     msg = "鐢ㄦ埛淇℃伅娣诲姞鎴愬姛锛�" ;
29:   }
30: %>


Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:626)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:515)
	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:733)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

根本原因。

java.lang.NullPointerException
	cn.mldn.common.service.proxy.ServiceProxy.invoke(ServiceProxy.java:31)
	com.sun.proxy.$Proxy5.add(Unknown Source)
	org.apache.jsp.pages.admin.member.member_005fadd_005fdo_jsp._jspService(member_005fadd_005fdo_jsp.java:156)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
	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:733)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

):注意 主要问题的全部 stack 信息可以在 server logs 里查看

断点一下看看

memberService 有没有值

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日期选择框没显示所以我一直没写生日就因为这个报空指针异常换了个浏览器日期选择框才出来