Java Database Connectivity (JDBC)

hi,

First time i try to connect to the oracle db 10.2.0* EE in java and its problem. I use eclipse 3.4, jre1.5.0_17, driver ojdbc14.jar (dedicated to this oracle ver and jre).


package connect;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class JDBC_Conn {
void polaczenie_z_baza() throws SQLException {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("connected");
} catch (Exception e) {
System.out.println("not connected");
}

Connection polaczenie=DriverManager.getConnection("jdbc:oracle:thin:@3.123.123.321:1521:RI3","user","pass");
}

public static void main(String[] args){
JDBC_Conn b = new JDBC_Conn();
try {
b.polaczenie_z_baza();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}



and after run in console i see: "connected" but after 2 seconds i see error:



java.sql.SQLException: Wyjątek we-wy: The Network Adapter could not establish the connection
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:439)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at connect.JDBC_Conn.polaczenie_z_baza(JDBC_Conn.java:18)
at connect.JDBC_Conn.main(JDBC_Conn.java:24)



This is important that i can login to the database by pl/sql developer using tnsnames.ora like this:


CIF2 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 3.123.123.321)(PORT = 1521))
)
(CONNECT_DATA =
(SID = RI3)
)
)


but when im logging by plsql developer i need to enter the name of database "DWH" too, another i cant login. The same when i log by sql plus, i need to enter the: user@DWH.

So please tell me could i add to this string:
"jdbc:oracle:thin:@3.123.123.321:1521:RI3","user","pass"
the DWH database? where i should to put it?

i try a lot of cases and cant login

thanks for help