public   static   void  main(String[] args) 
{
             final  String hostname = "localhost"; 
             final  String port = "3306"; 
             final  String dbname = "test_db"; 
             final  String user = "root"; 
             final  String password = "123"; 
            
           //Load the JDBC driver
            try  
           { 
           	 Class .forName("com.mysql.jdbc.Driver").newInstance(); 
           } 
            catch  (Exception e) 
           { 
                System.err.println("Unable to load driver."); 
                e.printStackTrace(); 
           } 
            try  
           { 
        	   System.out.println("* Establish a connection"); 
        	   String url = "jdbc:mysql://"+hostname+":"+port+"/"+dbname; 
       	           Connection conn = DriverManager.getConnection(url, user, password);      	       
           } 
            catch  (SQLException sqle)
           { 
	            System.out.println("SQLException: " + sqle.getMessage()); 
	            System.out.println("SQLState: " + sqle.getSQLState()); 
	            System.out.println("VendorError: " + sqle.getErrorCode()); 
	            sqle.printStackTrace();
	            System.exit( 1 );
	   }	       
}

//Class.forName("com.mysql.jdbc.Driver").newInstance(); 
DriverManager.registerDriver( new  com.mysql.jdbc.Driver());

C:\Program Files\Java\jdk1. 5 .0_06\bin>java -cp .;C:\Program Files\netbeans- 5 . 0 \e
nterprise2\jakarta-tomcat- 5 . 5 . 9 \server\lib\mysql-connector-java- 3 . 1 . 12 -bin.jar s
tart.Main
Exception in thread "main" java.lang.NoClassDefFoundError: Files\netbeans- 5 / 0 \en
terprise2\jakarta-tomcat- 5 / 5 / 9 \server\lib\mysql-connector-java- 3 / 1 / 12 -bin/jar