Notes/Domino 6 and 7 Forum : How to get data form DB2 by Agent schedule?

The following is my programe:
when running it by url,the agent wordks.
But in cliect running the agent at 18:00 everyday doen't work.
I have no idea.

import lotus.domino.*;
import java.net.*;
import java.util.*;
import java.io.*;
import java.text.*;
import java.sql.*;

public class JavaAgent extends AgentBase {

public void NotesMain() {

try {

System.out.println("000");

Session session = getSession();
AgentContext agentContext = session.getAgentContext();

Database db = agentContext.getCurrentDatabase();

String dbdriver = "COM.ibm.db2.jdbc.app.DB2Driver";
String dbid = "id";
String dbpsw = "password";
String dburl = "jdbc:db2:host";
Driver drv = (Driver)Class.forName(dbdriver).newInstance();
Connection con = DriverManager.getConnection(dburl,dbid,dbpsw);

String query = "select * from table";

View view = db.getView("Viewname");
Document firstdoc = view.getFirstDocument();
String key_old = firstdoc.getItemValueString("Update_date");
DocumentCollection dc_old = view.getAllDocumentsByKey(key_old);
dc_old rollback

Statement st = con.createStatement();
ResultSet rs = st.executeQuery(query);
DateTime dt = session.createDateTime("Today");

dt.setNow();
String tmpMonth = dt.getDateOnly().substring(0, 2);
String tmpDay = dt.getDateOnly().substring(3, 5);
String tmpYear = dt.getDateOnly().substring(6, dt.getDateOnly().length());

try
{
while(rs.next())
{
Document doc = db.createDocument();
doc.replaceItemValue("item1",String.valueOf(rs.getString("item1")));
doc.replaceItemValue("item2",String.valueOf(rs.getString("item2")));
doc.replaceItemValue("item3",String.valueOf(rs.getString("item3")));
doc.replaceItemValue("Update_date",tmpYear+"/"+tmpMonth+"/"+tmpDay);
doc.save();
}

dc_old.removeAll(true);
}
catch(Exception e)
{
String key_new = tmpYear+"/"+tmpMonth+"/"+tmpDay;
DocumentCollection dc_new = view.getAllDocumentsByKey(key_new);
dc_new.removeAll(true);
}
} catch(Exception e) {
e.printStackTrace();
}
}
}