java.lang.Noclassdeffounderror running application

Question

I made a java program that uses JDateChooser for the user to choose the date they want. It works normally within Eclipse but when I export the project to a .jar and try to run by cdm it shows the following error:

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: com/toedter/calendar/
JDateChooser
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
    at java.lang.Class.getMethod0(Class.java:3018)
    at java.lang.Class.getMethod(Class.java:1784)
    at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544
)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)

Caused by: java.lang.ClassNotFoundException: com.toedter.calendar.JDateChooser
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 7 more

Class using the JDateChooser:

import com.toedter.calendar.JDateChooser;
public class Login implements ActionListener {
    private JFrame ourFrame = new JFrame("Login");

    JTextField user_text = new JTextField();
    JPasswordField pass_text = new JPasswordField();
    static JDateChooser calendario = new JDateChooser();

    JButton yesButton = new JButton("Confirmar");
    JButton noButton = new JButton("Cancelar");

    public Login() {
        ourFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        ourFrame.setBounds(600, 300, 400, 250);

        Container container = ourFrame.getContentPane();
        container.setLayout(null);

        JLabel logo1 = new JLabel("LOGIN CLEARQUEST");
        logo1.setBounds(130, 10, 250, 20);

        JLabel user_label = new JLabel("Usuário:");
        user_label.setBounds(20, 35, 250, 30);

        JLabel pass_label = new JLabel("Senha:");
        pass_label.setBounds(20, 70, 250, 30);

        user_text.setBounds(70, 40, 250, 20);
        pass_text.setBounds(70, 75, 250, 20);

        JLabel logo2 = new JLabel("INSIRA A DATA DO ÚLTIMO RELATÓRIO");
        logo2.setBounds(83, 100, 250, 30);
        calendario.setBounds(83, 130, 210, 25);

        yesButton.setBounds(70, 170, 100, 30);
        yesButton.addActionListener(this);

        noButton.setBounds(210, 170, 100, 30);
        noButton.addActionListener(this);

        container.add(logo1);
        container.add(user_label);
        container.add(pass_label);
        container.add(user_text);
        container.add(pass_text);
        container.add(logo2);
        container.add(calendario);
        container.add(yesButton);
        container.add(noButton);
        ourFrame.setVisible(true);
    }

    @SuppressWarnings("deprecation")
    public void actionPerformed(ActionEvent aE) {
        if (aE.getSource() == yesButton) {
            String user = user_text.getText();
            String pass = pass_text.getText();

            RESTInvoker rest = new RESTInvoker(user, pass);
            String json = rest.getDataFromServer();

            try {
                // TODO pega os dados do json (arquivo txt retirado do clearquest) e joga em um Array de testes
                Teste[] teste = null;
                teste = Json.criarJson(teste, json);

                DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
                Date date = new Date();

                String caminhoTemplate = Variaveis.getCaminhoTemplate(); 
                String caminhoDestino = Variaveis.getCaminhoExcel() + dateFormat.format(date) + ".xls";

                // verificar o caminho
                CriacaoExcel.criandoArquivo(caminhoTemplate, caminhoDestino, teste);

            }

            catch (InvalidFormatException e) {
                CaixaDialogo.exibirErro(e.getMessage());
            }

            catch (ParseException e) {
                CaixaDialogo.exibirErro(e.getMessage());
            }

        } else if (aE.getSource() == noButton) {
            System.exit(0);
        }

    }

    // envia a data, do relaatório antigo, escolhida pelo usuario
    public static Date enviaData() {
        return calendario.getDate();
    }

    public static void main(String[] args) {
        // para setar o foco nos botões
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);
                new Login();
            }
        });
    }
}

I put the Jar of JCalendar as shown in the image below:

And I created a "Runnable Jar" of my project, as shown in the image below:

I drove by cmd with the following command: java -jar geradorStatus.jar -cp ./lib/jcalendar-1.4.jar

And the following error appeared:

Answer 1

Before generating the jar in the eclipse, the jcalendar lib needs to belong to the classpath of your project. To do this, add it by right-clicking on the project and select the option according to the print:

In the window that opens, click Add External JARs and include jcalendar lib.

Then, click again with the right button on the project, and select the option Export to create the jar. Select Java->Runnable Jar file.

On the next screen, select the main class of your application in Launch Configuration and just below check the option Extract required into generated JAR, so that dependencies are included in your jar correctly:

By following these steps correctly, the jar will run smoothly with the dependencies.

Answer 2

You have to run your application like this:

java -jar geradorStatus.jar -cp ./lib/jcalendar-1.4.jar