Failed to load JDBC driver

Question

I am trying to run a program and keep getting the error Failed to load JDBC driver. java.lang.ClassNotFoundException
How can I correct this?

Answer 1

I was just trying to execute this example from Deitel's Java book.
import java.awt.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
public class DisplayAuthors extends JFrame {
   // JDBC driver name and database URL
   static final String JDBC_DRIVER = "com.ibm.db2j.jdbc.DB2jDriver";
   static final String DATABASE_URL = "jdbc:db2j:books";
   // declare Connection and Statement for accessing
   // and querying database
   private Connection connection;
   private Statement statement;
   // constructor connects to database, queries database, processes
   // results and displays results in window
   public DisplayAuthors()
      super( "Authors Table of Books Database" );
      // connect to database books and query database
      try {
         // specify location of database on filesystem
         System.setProperty( "db2j.system.home", "C:/Cloudscape_5.0" );
         // load database driver class
         Class.forName( JDBC_DRIVER );
         // establish connection to database
         connection = DriverManager.getConnection( DATABASE_URL );
         // create Statement for querying database
         statement = connection.createStatement();
         // query database
         ResultSet resultSet =
            statement.executeQuery( "SELECT * FROM authors" );
         // process query results
         StringBuffer results = new StringBuffer();
         ResultSetMetaData metaData = resultSet.getMetaData();
         int numberOfColumns = metaData.getColumnCount();
         for ( int i = 1; i <= numberOfColumns; i++ )
            results.append( metaData.getColumnName( i ) + "\t" );
         results.append( "\n" );
         while ( resultSet.next() ) {
            for ( int i = 1; i <= numberOfColumns; i++ )
               results.append( resultSet.getObject( i ) + "\t" );
            results.append( "\n" );
         // set up GUI and display window
         JTextArea textArea = new JTextArea( results.toString() );
         Container container = getContentPane();
         container.add( new JScrollPane( textArea ) );
         setSize( 300, 100 );  // set window size
         setVisible( true );   // display window
      }  // end try
      // detect problems interacting with the database
      catch ( SQLException sqlException ) {
         JOptionPane.showMessageDialog( null, sqlException.getMessage(),
            "Database Error", JOptionPane.ERROR_MESSAGE );
         System.exit( 1 );
      // detect problems loading database driver
      catch ( ClassNotFoundException classNotFound ) {
         JOptionPane.showMessageDialog( null, classNotFound.getMessage(),
            "Driver Not Found", JOptionPane.ERROR_MESSAGE );           
         System.exit( 1 );
      // ensure statement and connection are closed properly
      finally {
         try {
            statement.close();
            connection.close();           
         // handle exceptions closing statement and connection
         catch ( SQLException sqlException ) {
            JOptionPane.showMessageDialog( null,
               sqlException.getMessage(), "Database Error",
               JOptionPane.ERROR_MESSAGE );
            System.exit( 1 );
   }  // end DisplayAuthors constructor
   // launch the application
   public static void main( String args[] )
      DisplayAuthors window = new DisplayAuthors();     
      window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
}  // end class DisplayAuthors