ActionListerner中的ClassNotFoundException

Question

I have the following error unreported exception ClassNotFoundException in my button action Listener and I'm unsure how i can resolve it, I tried adding Throw ClassNotFoundException but it was still giving me an error when trying to compile, I added it at

public void actionPerformed(ActionEvent e) throw ClassNotFoundException {
//action listeners for Login in button and menu item
        submitButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {

                    DisplaySearch.Search(jtfImagename.getText(), jtfLocation.getText(), jtfTimestamp.getText());

                    String Iname = jtfImagename.getText();
                    String Loc = jtfLocation.getText();
                    String Time = jtfTimestamp.getText();
                    accountReportArea.setText("Search Criteria \n" + "Image name : " + Iname + "\nLocation : " + Loc + "\nTime Stamp : " + Time);                 
                } catch (SQLException ex) {
                    ex.printStackTrace();
                    //    JOptionPane.showMessageDialog(null,
                    //            "Sorry, couldn't check your credentials. Check the logs and report the problem to an administrator.");
                    return;
                }
            }
        });

DisplaySearch {
    // database URL                              

    static final String DATABASE_URL = "jdbc:mysql://localhost:3306/mysql";
    static final String USERNAME = "root";
    static final String PASSWORD = "root";

    // launch the application
    public static void Search(String imageName, String DateStamp, String imageTag) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
        Connection connection = null; // manages connection
        Statement statement = null; // query statement
        ResultSet resultSet = null; // manages results

        // connect to database books and query database
        try {
            // establish connection to database
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            connection = DriverManager.getConnection(DATABASE_URL, USERNAME, PASSWORD);

            // create Statement for querying database
            statement = connection.createStatement();

            // query database                                        
            resultSet = statement.executeQuery(
                    "SELECT imageName, DateStamp, imageTag FROM images");

            // process query results   
            System.out.println("Search Criteria");

            while (resultSet.next()) {
                String Tag = resultSet.getString(imageTag);
                String Date = resultSet.getString(DateStamp);
                String Name = resultSet.getString(imageName);
                System.out.print("Image Name: " + Name);
                System.out.print(", Date: " + Date);
                System.out.print(", Tag: " + Tag);
            } // end while
        } // end try
        catch (SQLException sqlException) {
            sqlException.printStackTrace();
        } // end catch                                                     
        finally // ensure resultSet, statement and connection are closed
        {
            try {
                resultSet.close();
                statement.close();
                connection.close();
            } // end try                                               
            catch (Exception exception) {
                exception.printStackTrace();
            } // end catch                                             
        } // end finally                                              
    } // end main
} // end class

Answer 1

By adding throws ClassNotFoundException you won't solve any problems. You just indicate to someone who call this function, it could throw such an exception.

Since you are using Class.forName() you should include com.mysql.jdbc.Driver at run-time. Maybe a JAR is missing in your classpath?