SUPER URGENT - I can't connect Discoverer with my own Oracle Data Base

Please sobebody help me!
I've installed Oracle9i Personal, but I can't connect to Discoverer with it.
When I put the "username" , "password" and the "name of the bank" the system
returns the message:
'I was not able define the name of the service'
What must I do???
How can I configure the 'Oracle 9i Personal' to connect to Discoverer 4?

I have highlighted your error. You are trying to invoke a method over a null object.
Hi,
Is that something wrong with my db connection? Why I
can't insert the data to the db. By the way, I using
Tomcat 3.1, oracle enterprise 8.1.7 and JDK1.3
<html>
<head>
<basefont face="Arial">
<%@ page language="java" import="java.sql.*" %>
<%!
//define variable
String UId;
String FName;
String LName;
String city;
String phone;
String conn;
%>
<table border="2" cellspacing="2" cellpadding="5">
<tr>
<td><b>Owener</b></td>
<td><b>First Name</b></td>
<td><b>Last Name</b></td>
</tr>
<%
Connection connection = null;
Statement statement = null;
ResultSet results = null;
Statement SQLStatement =
connection.createStatement();
Class.forName("oracle.jdbc.driver.OracleDriver");
String url =
"jdbc:oracle:oci8@administrator:1521:mylogo";
connection = DriverManager.getConnection(url,
"sysman", "manager");
statement = connection.createStatement();
String Query = "SELECT * FROM USER";
ResultSet SQLResult =
SQLStatement.executeQuery(Query);
while(SQLResult.next())
UId = SQLResult.getString("LNAME");
FName = SQLResult.getString("FNAME");
LName = SQLResult.getString("DEPT");
city = SQLResult.getString("TITLE");
phone = SQLResult.getString("TEL");
out.println("<tr><td>" + UId + "</td></td>" + FName
me + "</td><td>" + LName
+"</td><td>" + city + "</td><td>" + phone +"
+" </td>");
%>
<td> <a
a href="delete.jsp?uid=<%=UId%>">delete</a></td>
<td> <a
a href="editform.jsp?uid=<%=UId%>">edit</a></td>
<td> <a href="insert.htm">Insert</a></td>
<tr>
<%
//close connection
SQLResult.close();
SQLStatement.close();
connection.close();
%>
</table>
</body>
</html>
Any help is appreciated !

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