为何浏览器会报对象为空呢？
<%@ page contentType= "text/html; charset=gb2312 " %>
<%@ page import= "java.sql.* " %>
<%@ page language= "java " %>
<%@ page import= "java.util.Date " %>
<%@ page import= "common.* " %>
<%@ page import= "java.text.* " %>
<jsp:useBean id= "checkdata " class= "common.CheckData " scope= "page " />
<jsp:useBean id= "user " class= "simis.User " scope= "session " />
<%if (!user.isLogin()) {%>
<jsp:include page= "loginFail.jsp " flush= "true " />
<%} else {%>
<%!
String strSQL =null;//查询语句
String strYear=null; //年份
String strBegin=null;//起始年月
String strEnd=null;//终止年月
String isNull =null;//存放年份
Date nowDate = new Date();
ResultSet rs = null;
DBSQL db = new DBSQL();
CodeTable codeTable = null;
%>
<%
isNull = request.getParameter( "Year ");
if(isNull != null)
{
strYear = isNull;
}
else if(user.getYear() != null)
{
strYear = user.getYear();
}
else
{
strYear =Integer.toString(DateTool.convertDateToYear(nowDate));
}
strBegin = strYear;
strEnd = Integer.toString(Integer.parseInt(strYear)+1);
String strBegin=null;//起始年月和 else if(user.getYear() != null)．
一进这个网页先报前者对象为空，查询其他年份就报后者对象为空．
如何解决呢？谢谢．
[解决办法]
your javabean has a error.
