java.lang.NoClassDefFoundError

Hi,

Could you help me in my program JAVA with jdbc Postgre

import java.sql.DriverManager;

import java.sql.Connection;

import java.sql.SQLException;

public class Example2 {

  public static void main(String[] argv) {

  System.out.println("Checking if Driver is registered with DriverManager.");

  try {

    Class.forName("org.postgresql.Driver");

  } catch (ClassNotFoundException cnfe) {

    System.out.println("Couldn't find the driver!");

    System.out.println("Let's print a stack trace, and exit.");

    cnfe.printStackTrace();

    System.exit(1);

  }

  }

Then I execute :

javac Example2.java

Then I execute

            java Example2

but I get

Exception in thread "main" java.lang.NoClassDefFoundError: Example

Wich is my error ?

I copied pg73jdbc3.jar  in my path

C:\j2sdk1.4.1_07\lib\

Its have org.postgresql.Driver

Thanks advanted

ana