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LWP » Foros » Java » Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class com.mysql.cj.jdbc.Connect

Java - Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class com.mysql.cj.jdbc.Connect

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Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class com.mysql.cj.jdbc.Connect

Publicado por Angel (3 intervenciones) el 24/06/2020 15:38:49
Buenas, estoy intentado hacer un JFrame en el cual introduzco unos datos y los introduce en una JTable y en una base de datos. El problema creo que está en la conexion, ya que recibo este error:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class com.mysql.cj.jdbc.ConnectionImpl cannot be cast to class com.sun.jdi.connect.spi.Connection (com.mysql.cj.jdbc.ConnectionImpl is in unnamed module of loader 'app'; com.sun.jdi.connect.spi.Connection is in module jdk.jdi of loader 'app')

Este es mi codigo:

Ventana.java (JFrame)
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import java.sql.SQLException;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.table.DefaultTableModel;
 
 public class Ventana extends javax.swing.JFrame {
DefaultTableModel dtm;
public Ventana() {
    initComponents();
    dtm = (DefaultTableModel) tabla.getModel();
    txtpreciodiario.setEditable(false);
}
 
/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
 
          jPanel1 = new javax.swing.JPanel();
          jLabel1 = new javax.swing.JLabel();
          jLabel2 = new javax.swing.JLabel();
          jLabel3 = new javax.swing.JLabel();
          jScrollPane1 = new javax.swing.JScrollPane();
          txtcaracteristicas = new javax.swing.JTextArea();
          jLabel4 = new javax.swing.JLabel();
          jScrollPane2 = new javax.swing.JScrollPane();
          txtdescripcion = new javax.swing.JTextArea();
          jLabel5 = new javax.swing.JLabel();
          txtnumero = new javax.swing.JTextField();
          txtpreciodiario = new javax.swing.JTextField();
          jLabel6 = new javax.swing.JLabel();
          txtestado = new javax.swing.JComboBox<>();
          jLabel7 = new javax.swing.JLabel();
          txttipohabitacion = new javax.swing.JComboBox<>();
          jTextField4 = new javax.swing.JTextField();
          jTextField6 = new javax.swing.JTextField();
          txtpiso = new javax.swing.JSpinner();
          btnenviar = new javax.swing.JButton();
          jPanel2 = new javax.swing.JPanel();
    jLabel8 = new javax.swing.JLabel();
    jTextField11 = new javax.swing.JTextField();
    jTextField12 = new javax.swing.JTextField();
    jTextField13 = new javax.swing.JTextField();
    jTextField14 = new javax.swing.JTextField();
    jScrollPane3 = new javax.swing.JScrollPane();
    tabla = new javax.swing.JTable();
 
    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
    jLabel1.setText("Piso:");
 
    jLabel2.setText("Número:");
 
    jLabel3.setText("Descripción:");
 
    txtcaracteristicas.setColumns(20);
    txtcaracteristicas.setRows(5);
    jScrollPane1.setViewportView(txtcaracteristicas);
 
    jLabel4.setText("Características");
 
    txtdescripcion.setColumns(20);
    txtdescripcion.setRows(5);
    jScrollPane2.setViewportView(txtdescripcion);
 
    jLabel5.setText("Precio Diario:");
 
    txtnumero.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            txtnumeroActionPerformed(evt);
        }
    });
 
    txtpreciodiario.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            txtpreciodiarioActionPerformed(evt);
        }
    });
 
    jLabel6.setText("Estado:");
 
    txtestado.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
 
    jLabel7.setText("Tipo Habitación:");
 
    txttipohabitacion.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
 
    jTextField4.setText("Nuevo");
    jTextField4.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jTextField4ActionPerformed(evt);
        }
    });
 
    jTextField6.setText("Cancelar");
    jTextField6.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jTextField6ActionPerformed(evt);
        }
    });
 
    btnenviar.setText("Enviar");
    btnenviar.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnenviarActionPerformed(evt);
        }
    });
 
    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addContainerGap()
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel1)
                        .addComponent(jLabel2)
                        .addComponent(jLabel3)
                        .addComponent(jLabel4)
                        .addComponent(jLabel5)
                        .addComponent(jLabel6)
                        .addComponent(jLabel7))
                    .addGap(52, 52, 52)
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(txttipohabitacion, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(txtestado, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 189, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(txtnumero, javax.swing.GroupLayout.PREFERRED_SIZE, 199, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(txtpreciodiario, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 189, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(txtpiso, javax.swing.GroupLayout.PREFERRED_SIZE, 95, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(48, 48, 48)
                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(39, 39, 39)
                    .addComponent(btnenviar)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(11, 11, 11)))
            .addGap(0, 17, Short.MAX_VALUE))
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGap(30, 30, 30)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel2)
                .addComponent(txtnumero, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(18, 18, 18)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel1)
                .addComponent(txtpiso, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addComponent(jLabel3)
                    .addGap(74, 74, 74))
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(18, 18, 18)))
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel4)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(txtpreciodiario, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel5))
            .addGap(26, 26, 26)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel6)
                .addComponent(txtestado, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(18, 18, 18)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel7)
                .addComponent(txttipohabitacion, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(29, 29, 29)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(btnenviar))
            .addContainerGap(97, Short.MAX_VALUE))
    );
 
    jLabel8.setText("Buscar:");
 
    jTextField11.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jTextField11ActionPerformed(evt);
        }
    });
 
    jTextField12.setText("Buscar");
    jTextField12.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jTextField12ActionPerformed(evt);
        }
    });
 
    jTextField13.setText("Eliminar");
    jTextField13.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jTextField13ActionPerformed(evt);
        }
    });
 
    jTextField14.setText("Salir");
    jTextField14.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jTextField14ActionPerformed(evt);
        }
    });
 
    tabla.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {
 
        },
        new String [] {
            "ID", "Numero", "Piso", "Descripcion", "Caracteristicas", "Precio diario", "Estado", "Tipo de habitacion"
        }
    ) {
        Class[] types = new Class [] {
            java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class
        };
 
        public Class getColumnClass(int columnIndex) {
            return types [columnIndex];
        }
    });
    jScrollPane3.setViewportView(tabla);
 
    javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
    jPanel2.setLayout(jPanel2Layout);
    jPanel2Layout.setHorizontalGroup(
        jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel2Layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jLabel8)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jTextField11, javax.swing.GroupLayout.PREFERRED_SIZE, 93, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(18, 18, 18)
            .addComponent(jTextField12, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jTextField13, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jTextField14, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(79, Short.MAX_VALUE))
        .addGroup(jPanel2Layout.createSequentialGroup()
            .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
            .addContainerGap())
    );
    jPanel2Layout.setVerticalGroup(
        jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel2Layout.createSequentialGroup()
            .addGap(28, 28, 28)
            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel8)
                .addComponent(jTextField11, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jTextField12, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jTextField13, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jTextField14, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 26, Short.MAX_VALUE)
            .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 438, javax.swing.GroupLayout.PREFERRED_SIZE))
    );
 
    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(48, 48, 48)
            .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(69, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addContainerGap(33, Short.MAX_VALUE))
    );
 
    pack();
}// </editor-fold>
 
private void txtnumeroActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
}
 
private void txtpreciodiarioActionPerformed(java.awt.event.ActionEvent evt) {
 
}
 
private void jTextField4ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
}
 
private void jTextField6ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
}
 
private void jTextField14ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
}
 
private void jTextField13ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
}
 
private void jTextField12ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
}
 
private void jTextField11ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
}
 
private void btnenviarActionPerformed(java.awt.event.ActionEvent evt) {
    var numero = txtnumero.getText();
    int valor = (Integer)txtpiso.getValue();
    var descripcion = txtdescripcion.getText();
    var caracteristicas = txtcaracteristicas.getText();
    var preciodiario = txtpreciodiario.getText();
    String estado = (String) txtestado.getSelectedItem();
    String tipohabitacion = (String) txttipohabitacion.getSelectedItem();
 
    int totalprecio = valor * 150;
    var totalpreciostring = Integer.toString(totalprecio);
    txtpreciodiario.setText(totalpreciostring);
 
    String[] datos= new String[8];
    datos[0]= numero;
    datos[1]= Integer.toString(valor);
    datos[2]= descripcion;
    datos[3]= caracteristicas;
    datos[4]= preciodiario;
    datos[5]= estado;
    datos[6]= tipohabitacion;
    System.out.println("datos = " + Arrays.toString(datos));
    dtm.addRow(datos);
 
    conexion conexion = new conexion();
 
    try {
        conexion.conectar();
    } catch (SQLException ex) {
        Logger.getLogger(Ventana.class.getName()).log(Level.SEVERE, null, ex);
    }
 
 
}
 
/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Ventana.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>
 
    //</editor-fold>
 
    /* Create and display the form */
    java.awt.EventQueue.invokeLater(() -> {
        new Ventana().setVisible(true);
    });
}
 
// Variables declaration - do not modify
private javax.swing.JButton btnenviar;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JTextField jTextField11;
private javax.swing.JTextField jTextField12;
private javax.swing.JTextField jTextField13;
private javax.swing.JTextField jTextField14;
private javax.swing.JTextField jTextField4;
private javax.swing.JTextField jTextField6;
private javax.swing.JTable tabla;
private javax.swing.JTextArea txtcaracteristicas;
private javax.swing.JTextArea txtdescripcion;
private javax.swing.JComboBox<String> txtestado;
private javax.swing.JTextField txtnumero;
private javax.swing.JSpinner txtpiso;
private javax.swing.JTextField txtpreciodiario;
private javax.swing.JComboBox<String> txttipohabitacion;
// End of variables declaration

conexion.java
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import com.sun.jdi.connect.spi.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
 
 
 public class conexion {
     public static final String url = "jdbc:mysql://localhost:3306/basereserva";
     public static final String usuario = "root";
     public static final String contraseña = "";
 
 
     public static Connection conectar() throws SQLException {
 
 
         Connection con = null;
         try{
             Class.forName("com.mysql.cj.jdbc.Driver");
             con = (Connection) DriverManager.getConnection(url, usuario, contraseña);
         } catch (ClassNotFoundException e) {
             System.out.println(e);
    }
    return con;
      }
   }

Gracias de antemano
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Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class com.mysql.cj.jdbc.Connect

Publicado por Tom (1831 intervenciones) el 24/06/2020 16:26:01
No entiendo lo que haces ...
¿ Qué es com.sun.jdi.connect.spi.Connection ?
DriverManager.getConnection() retorna java.sql.Connection.
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sin imagen de perfil
Val: 6
Ha disminuido su posición en 292 puestos en Java (en relación al último mes)
Gráfica de Java

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class com.mysql.cj.jdbc.Connect

Publicado por Angel (3 intervenciones) el 24/06/2020 18:04:09
Si, ya he solucionado ese error, pero ahora me da este: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at Ventana.btnenviarActionPerformed(Ventana.java:370)
	at Ventana$5.actionPerformed(Ventana.java:129)
	at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
	at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
	at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
	at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
	at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)
	at java.desktop/java.awt.Component.processMouseEvent(Component.java:6631)
	at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
	at java.desktop/java.awt.Component.processEvent(Component.java:6396)
	at java.desktop/java.awt.Container.processEvent(Container.java:2263)
	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5007)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4839)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
	at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4839)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Este es ahora el codigo:

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import java.sql.Statement;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import javax.swing.table.DefaultTableModel;
 
 
public class Ventana extends javax.swing.JFrame {
    private conexion mysql= new conexion();
    private Connection con=(Connection) mysql.conectar();
    private String queryJTable="";
    DefaultTableModel dtm;
    private void queryjtable(){
 
 
        String [] titulos = {"ID", "Numero", "Piso", "Descripcion", "Caracteristicas", "Precio diario", "Estado", "Tipo de habitacion"};
        dtm = new DefaultTableModel(null, titulos);
 
        queryJTable="Select * from habitacion";
 
        try {
 
            Statement st=(Statement) con.createStatement();
            ResultSet rs = st.executeQuery(queryJTable);
        } catch (SQLException e) {
        }
}
    public Ventana() {
        initComponents();
 
        txtpreciodiario.setEditable(false);
    }
 
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
 
        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        txtcaracteristicas = new javax.swing.JTextArea();
        jLabel4 = new javax.swing.JLabel();
        jScrollPane2 = new javax.swing.JScrollPane();
        txtdescripcion = new javax.swing.JTextArea();
        jLabel5 = new javax.swing.JLabel();
        txtnumero = new javax.swing.JTextField();
        txtpreciodiario = new javax.swing.JTextField();
        jLabel6 = new javax.swing.JLabel();
        txtestado = new javax.swing.JComboBox<>();
        jLabel7 = new javax.swing.JLabel();
        txttipohabitacion = new javax.swing.JComboBox<>();
        jTextField4 = new javax.swing.JTextField();
        jTextField6 = new javax.swing.JTextField();
        txtpiso = new javax.swing.JSpinner();
        btnenviar = new javax.swing.JButton();
        jPanel2 = new javax.swing.JPanel();
        jLabel8 = new javax.swing.JLabel();
        jTextField11 = new javax.swing.JTextField();
        jTextField12 = new javax.swing.JTextField();
        jTextField13 = new javax.swing.JTextField();
        jTextField14 = new javax.swing.JTextField();
        jScrollPane3 = new javax.swing.JScrollPane();
        tabla = new javax.swing.JTable();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        jLabel1.setText("Piso:");
 
        jLabel2.setText("Número:");
 
        jLabel3.setText("Descripción:");
 
        txtcaracteristicas.setColumns(20);
        txtcaracteristicas.setRows(5);
        jScrollPane1.setViewportView(txtcaracteristicas);
 
        jLabel4.setText("Características");
 
        txtdescripcion.setColumns(20);
        txtdescripcion.setRows(5);
        jScrollPane2.setViewportView(txtdescripcion);
 
        jLabel5.setText("Precio Diario:");
 
        txtnumero.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtnumeroActionPerformed(evt);
            }
        });
 
        txtpreciodiario.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtpreciodiarioActionPerformed(evt);
            }
        });
 
        jLabel6.setText("Estado:");
 
        txtestado.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
 
        jLabel7.setText("Tipo Habitación:");
 
        txttipohabitacion.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
 
        jTextField4.setText("Nuevo");
        jTextField4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField4ActionPerformed(evt);
            }
        });
 
        jTextField6.setText("Cancelar");
        jTextField6.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField6ActionPerformed(evt);
            }
        });
 
        btnenviar.setText("Enviar");
        btnenviar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnenviarActionPerformed(evt);
            }
        });
 
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel1)
                            .addComponent(jLabel2)
                            .addComponent(jLabel3)
                            .addComponent(jLabel4)
                            .addComponent(jLabel5)
                            .addComponent(jLabel6)
                            .addComponent(jLabel7))
                        .addGap(52, 52, 52)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(txttipohabitacion, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(txtestado, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 189, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(txtnumero, javax.swing.GroupLayout.PREFERRED_SIZE, 199, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(txtpreciodiario, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 189, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(txtpiso, javax.swing.GroupLayout.PREFERRED_SIZE, 95, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(48, 48, 48)
                        .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(39, 39, 39)
                        .addComponent(btnenviar)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(11, 11, 11)))
                .addGap(0, 17, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(30, 30, 30)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(txtnumero, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(txtpiso, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addGap(74, 74, 74))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                        .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)))
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel4)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(txtpreciodiario, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel5))
                .addGap(26, 26, 26)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel6)
                    .addComponent(txtestado, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel7)
                    .addComponent(txttipohabitacion, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(29, 29, 29)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnenviar))
                .addContainerGap(97, Short.MAX_VALUE))
        );
 
        jLabel8.setText("Buscar:");
 
        jTextField11.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField11ActionPerformed(evt);
            }
        });
 
        jTextField12.setText("Buscar");
        jTextField12.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField12ActionPerformed(evt);
            }
        });
 
        jTextField13.setText("Eliminar");
        jTextField13.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField13ActionPerformed(evt);
            }
        });
 
        jTextField14.setText("Salir");
        jTextField14.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField14ActionPerformed(evt);
            }
        });
 
        tabla.setModel(new javax.swing.table.DefaultTableModel(
 
            new Object [][] {
 
            },
            new String [] {
                "ID", "Numero", "Piso", "Descripcion", "Caracteristicas", "Precio diario", "Estado", "Tipo de habitacion"
            }
        ) {
            Class[] types = new Class [] {
                java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class
            };
 
            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
            }
        });
        jScrollPane3.setViewportView(tabla);
 
        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel8)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jTextField11, javax.swing.GroupLayout.PREFERRED_SIZE, 93, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jTextField12, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jTextField13, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jTextField14, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(79, Short.MAX_VALUE))
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
                .addContainerGap())
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addGap(28, 28, 28)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel8)
                    .addComponent(jTextField11, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField12, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField13, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField14, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 26, Short.MAX_VALUE)
                .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 438, javax.swing.GroupLayout.PREFERRED_SIZE))
        );
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(48, 48, 48)
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(69, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap(33, Short.MAX_VALUE))
        );
 
        pack();
    }// </editor-fold>
 
    private void txtnumeroActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }
 
    private void txtpreciodiarioActionPerformed(java.awt.event.ActionEvent evt) {
 
    }
 
    private void jTextField4ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }
 
    private void jTextField6ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }
 
    private void jTextField14ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }
 
    private void jTextField13ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }
 
    private void jTextField12ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }
 
    private void jTextField11ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }
 
    private void btnenviarActionPerformed(java.awt.event.ActionEvent evt) {
        var numero = txtnumero.getText();
        int valor = (Integer)txtpiso.getValue();
        var descripcion = txtdescripcion.getText();
        var caracteristicas = txtcaracteristicas.getText();
        var preciodiario = txtpreciodiario.getText();
        String estado = (String) txtestado.getSelectedItem();
        String tipohabitacion = (String) txttipohabitacion.getSelectedItem();
 
        int totalprecio = valor * 150;
        var totalpreciostring = Integer.toString(totalprecio);
        txtpreciodiario.setText(totalpreciostring);
 
        String[] datos= new String[8];
        datos[0]= numero;
        datos[1]= Integer.toString(valor);
        datos[2]= descripcion;
        datos[3]= caracteristicas;
        datos[4]= preciodiario;
        datos[5]= estado;
        datos[6]= tipohabitacion;
        System.out.println("datos = " + Arrays.toString(datos));
        dtm.addRow(datos);
 
        queryjtable();
 
 
 
 
 
    }
 
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Ventana.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        //</editor-fold>
 
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(() -> {
            new Ventana().setVisible(true);
        });
    }
 
    // Variables declaration - do not modify
    private javax.swing.JButton btnenviar;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JLabel jLabel8;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JScrollPane jScrollPane3;
    private javax.swing.JTextField jTextField11;
    private javax.swing.JTextField jTextField12;
    private javax.swing.JTextField jTextField13;
    private javax.swing.JTextField jTextField14;
    private javax.swing.JTextField jTextField4;
    private javax.swing.JTextField jTextField6;
    private javax.swing.JTable tabla;
    private javax.swing.JTextArea txtcaracteristicas;
    private javax.swing.JTextArea txtdescripcion;
    private javax.swing.JComboBox<String> txtestado;
    private javax.swing.JTextField txtnumero;
    private javax.swing.JSpinner txtpiso;
    private javax.swing.JTextField txtpreciodiario;
    private javax.swing.JComboBox<String> txttipohabitacion;
    // End of variables declaration
 
}

conexion.java
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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
 
/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author Angel
 */
public class conexion {
    public static String url = "jdbc:mysql://localhost:3306/basereserva";
    public static String usuario = "root";
    public static String  contraseña = "";
 
    public conexion(){
 
    }
    public static Connection conectar(){
            Connection conexion=null;
        try {
                    Class.forName("com.mysql.cj.jdbc.Driver");
                    conexion = (Connection) DriverManager.getConnection(url, usuario, contraseña);
 
            } catch (ClassNotFoundException | SQLException e) {
            System.out.println(e);
        }
        return null;
    }
}
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Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class com.mysql.cj.jdbc.Connect

Publicado por Cesar (1 intervención) el 19/10/2022 18:17:06
Como has solucionado el primer error que tenias llevo varios días y nada de nada.
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