import java.sql.*;
import java.io.FileInputStream;
import java.util.Properties;
class JdbcCallProc {
 public static void main (String args []) throws Exception {
  DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
  Properties props = new Properties();
  props.load(new FileInputStream("conn.props"));
  Connection conn = DriverManager.getConnection(props.getProperty("url"), props);

  CallableStatement call = conn.prepareCall("{? = call greet(?)}");
  call.registerOutParameter(1,java.sql.Types.VARCHAR);
  call.setString(2,args[0]);
  call.execute();
  String answer = call.getString(1);
  System.out.println(answer);
  conn.close();
}}