[SouJava-J] conexao oracle

Eu coloquei classes111.zip no classpath e quando tento executar esta classse da este erro:

Erro:

The Network Adapter could not establish the connection

Codigo:
import java.sql.*;

import oracle.jdbc.driver.*;

import oracle.*;

class ConexaoOracle {

public static void main (String [] args) {

Connection conn = null;

Statement stmt = null;

try {

DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());

System.out.println("Driver Registrado !");

conn=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","SYSTEM","manager");

// da erro aqui

Rodrigo

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