相关疑难解决方法(0)

NoClassDefFoundError当我运行我的Java应用程序时,我得到了一个.这通常是什么原因？

public class LoginCumReg implements ActionListener,KeyListener {
    private JFrame form;
    private JTextField txtunm;
    private JTextField txtnm;
    private JTextField txteml;
    private JButton cmdcreate;
    private JPasswordField txtpass;
    private JPasswordField txtpassreg;
    private JButton cmdok;
    private JLabel lblunm;
    private JLabel lblpass;
    private JLabel lbleml;
    private JLabel lblpassreg;
    private JLabel lblnm;
    private JPanel panel_1;
public LoginCumReg() {
    // construct components
    form = new JFrame("Sign Up");
    form.getContentPane().setFont(
            new Font("Plantagenet Cherokee", Font.BOLD, 18));
    txtunm = new JTextField(5);
    txtunm.addKeyListener(this);
    txtunm.setBounds(637, 55, 100, 25);
    txtnm = new JTextField(5);
    txtnm.setBounds(637, 228, …

我编写了maven项目，并在Eclipse中运行了它，但是我想使用命令行来运行maven项目，所以我写了

java -jar -Dapple.awt.UIElement="true" target/myproject-1.0-SNAPSHOT.jar -h

行在cmd中，但出现此错误http://i.stack.imgur.com/c03mN.png。

我该如何解决？