Question

我想帮助我：

我有一个系统用户注册JInternalFrame，并且有另一个系统用户级访问权限注册JInternalFrame。

当某人填写数据以注册用户并按REGISTER按钮时，请拨打我的系统用户级访问权限JInternalFrame。

我试图按照他们在其他帖子中所说的做但却没有用。

public void cadastrarUsuarios() throws ClassNotFoundException, InstantiationException, IllegalAccessException {

    String sql = "Insert into login (nome_login, usuario_login, senha_login) values (?,?,?)";

    try {

        pst = con.prepareStatement(sql);
        pst.setString(1, txtNome.getText()); //Passando valor de "nome de usuário" para o campo da tabela "txtNome"
        pst.setString(2, txtUsuario.getText()); //Passando valor de "telefone de usuário" para o campo da tabela "txtTelefone"
        pst.setString(3, txtSenha.getText()); //Passando valor de "Endereço de usuário" para o campo da tabela "txtTelefone"

        pst.execute();

        JOptionPane.showMessageDialog(null, "Usuário cadastrado com sucesso!", "Cadastrado com sucesso", JOptionPane.INFORMATION_MESSAGE);

        listarUsuarios(); //Atualizando dados na tabela instantaneamente no momento do cadastro do usuário

        JDesktopPane desktopPane = this.getDesktopPane();
        desktopPane.add(frmCadNiveisAcesso);
        frmCadNiveisAcesso.setVisible(true);

    } 

    catch (SQLException error) {

        JOptionPane.showMessageDialog(null, error);
    }
}

这是错误：

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:363)
at java.util.Hashtable.get(Hashtable.java:363)
at javax.swing.JLayeredPane.getLayer(JLayeredPane.java:396)
at javax.swing.JLayeredPane.addImpl(JLayeredPane.java:228)
at javax.swing.JDesktopPane.addImpl(JDesktopPane.java:483)
at java.awt.Container.add(Container.java:415)
at VISUAL.FRMCadUsuarios.cadastrarUsuarios(FRMCadUsuarios.java:85)
at VISUAL.FRMCadUsuarios.BTCadastrarActionPerformed(FRMCadUsuarios.java:380)
at VISUAL.FRMCadUsuarios.access$200(FRMCadUsuarios.java:16)
at VISUAL.FRMCadUsuarios$3.actionPerformed(FRMCadUsuarios.java:261)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6527)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6292)
at java.awt.Container.processEvent(Container.java:2234)
at java.awt.Component.dispatchEventImpl(Component.java:4883)
at java.awt.Container.dispatchEventImpl(Container.java:2292)
at java.awt.Component.dispatchEvent(Component.java:4705)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
at java.awt.Container.dispatchEventImpl(Container.java:2278)
at java.awt.Window.dispatchEventImpl(Window.java:2739)
at java.awt.Component.dispatchEvent(Component.java:4705)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:719)
at java.awt.EventQueue$4.run(EventQueue.java:717)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

从另一个JInternalFrame调用JInternalFrame

0 个答案: