import java.io.*;
	import java.util.*;
	import java.sql.Connection;
	import java.sql.DriverManager;
	import java.sql.ResultSet;
	import java.sql.SQLException;
	import java.sql.Statement;
	import java.util.logging.Level;
	import java.util.*;

	public class Sample {
		public static void main (String[] args) throws IOException  {
						int CountComputers;
				FileInputStream fstream = new FileInputStream(
						"/export/hadoop-1.0.1/bin/countcomputers.txt");
				DataInputStream input = new DataInputStream(fstream);
				BufferedReader br = new BufferedReader(new InputStreamReader(input));
				String result=br.readLine();
				CountComputers=Integer.parseInt(result);
				input.close();
				fstream.close();
				Connection con = null;
				Statement st = null;
					ResultSet rs = null;    
				   String url = "jdbc:postgresql://192.168.1.8:5432/NexentaSearch";
					String user = "postgres";
					String password = "valter89";
				ArrayList<String> paths = new ArrayList<String>();
				try
				{
					con = DriverManager.getConnection(url, user, password);
							st = con.createStatement();
							rs = st.executeQuery("select path from tasks order by id");
					while (rs.next()) { paths.add(rs.getString(1)); };
					PrintWriter zzz = null;
						try
						{
								zzz = new PrintWriter(new FileOutputStream("/export/hadoop-1.0.1/bin/readwaysfromdatabase.txt"));
						}
						catch(FileNotFoundException e)
						{
								System.out.println("Error");
								System.exit(0);
						}
						for (int i=0; i<paths.size(); i++)
					{
						zzz.println("paths[i]=" + paths.get(i) + "\n");
						}
						zzz.close();
					
				}
				catch (SQLException e) 
				{
					System.out.println("Connection Failed! Check output console");
					e.printStackTrace();
				}
			}
	}

./javac -classpath /folder/postgresql-8.4-703.jdbc3.jar -d /Samplejavaprogram/classes /Samplejavaprogram/src/Sample.java
./jar -cvf /Samplejavaprogram/Sample.jar -C /Samplejavaprogram/classes/ .

Connection Failed! Check output console
	java.sql.SQLException: No suitable driver found for jdbc:postgresql://192.168.1.8:5432/NexentaSearch
		at java.sql.DriverManager.getConnection(DriverManager.java:604)
		at java.sql.DriverManager.getConnection(DriverManager.java:221)
		at org.myorg.Sample.main(Sample.java:33)