HTTP Status 500An exception occurred processing JSP page /modifyRegister.jsp

[plusing]

HTTP Status 500 - An exception occurred processing JSP page /modifyRegister.jsp at line 66


代码：
<table>
输入您的新信息:
<tr><td>电子邮件:</td>
<td><Input type=text name="email" value="<%= oldEmail %>"></td></tr>
<tr><td>真实姓名:</td>
<td><Input type=text name="realname" value="<%= oldRealname %>"></td></tr>
<tr><td>联系电话:
</td><td><Input type=text name="phone" value="<%= oldPhone %>"></td></tr>
<tr><td>通信地址:
</td><td><Input type=text name="address" value="<%= oldAddress %>"></td></tr>
<tr><td><Input type=submit name="enter" value="提交"></td> </tr>
</table><Font></CENTER>
</BODY>
</HTML>
<%
String enter=request.getParameter("enter");
String email=request.getParameter("email");
String realname=request.getParameter("realName");
String phone=request.getParameter("phone");
String address=request.getParameter("address");
boolean ok=(enter!=null);
if(ok&&isModify){
66行：%><modifyRegister:ModifyRegister logname="<%=logname%>" email="<%=email%>"
phone="<%=phone%>" address="<%=address%>" realname="<%=realname%>"/>
<center><h2><%= giveResult %></h2></center>
<% }
%>

[plusing]

tag的文件 <%@ tag import="java.sql.*" %> <%@ tag pageEncoding="UTF-8" %> <%@ attribute name="logname" required="true" %> <%@ attribute name="email" required="true" %> <%@ attribute name="address" required="true" %> <%@ attribute name="realname" required="true" %> <%@ attribute name="phone" required="true" %> <%@ variable name-given="giveResult" variable-class= "java.lang.StringBuffer" scope="AT_END" %> <% byte[]c=email.getBytes("iso-8859-1"); email=new String(c); c=address.getBytes("iso-8859-1"); address=new String(c); c=realname.getBytes("iso-8859-1"); realname=new String(c); c=phone.getBytes("iso-8859-1"); phone=new String(c); try{ Class.forName("com.mysql.jdbc.Driver"); } catch(ClassNotFoundException e){ out.print(e); } StringBuffer str=new StringBuffer(); Connection con; Statement sql; ResultSet rs; String uri="jdbc:mysql://localhost:3306/ly?"+"user=root&password=root&characterEncoding=utf8"; try{ con=DriverManager.getConnection(uri); String updateCondition="UPDATE user SET phone='"+phone+"',email='"+ email+"',address='"+address+"',realname='"+realname+"' WHERE logname='"+logname+"'"; sql=con.createStatement(); int m=sql.executeUpdate(updateCondition); if(m==1) { str.append("修改信息成功"); } else { str.append("更新失败"); } con.close(); } catch(SQLException exp){ str.append("更新失败"+exp); } jspContext.setAttribute("giveResult",str); %>