jdbc与db2连接，可是有一句总报错（代码如下），为什么？在线等候，谢谢！

<%@ page import = "java.sql.*" %>
<%@ page import = "javax.sql.*" %>

<%!
Connection tConnection;
%>
<%
try{
Class.forName("COM.ibm.db2.jdbc.app.DB2Driver");
tConnection = DriverManager.getConnection("jdbc:db2:test");//, tUser, tPassWord
/*** Statement tStmt = tConnection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
***/
ResultSet tRs = tStmt.executeQuery("select * from b2bfuncreq");
while(tRs.next()) {
out.println(tRs.getString(1));
out.println(tRs.getString(2));
out.println(tRs.getString(3));
}
tConnection.close();
}
catch (Exception e) {
if (tConnection != null)
tConnection.close();
out.println("Exception caught: " + e);
}
%>