Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
Publicado por ANAHI (2 intervenciones) el 28/06/2019 08:16:18
Hola, estoy tratando de generar consultas y modificaciones en netbeans conectado con mysql la conexion se encuentra bien hecha y a la vista no hay errores pero cuando le doy run me sale este error, no se como solucionarlo por favor si alguien me podria ayudar!
Gracias
ERROR
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at clases.Producto.mostrar(Producto.java:94)
at clases.Producto.<init>(Producto.java:25)
at clases.Producto.lambda$main$0(Producto.java:729)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
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)
Gracias
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public final class Producto extends javax.swing.JFrame {
Connection con;
Statement stmt;
String var,var2;public Producto() {
initComponents();
limpi();
bloq();
mostrar();
this.setTitle("PRODUCTOS");
this.setLocation(100,55);
this.setResizable(false);
ImageIcon icono = new ImageIcon("C:\\Users\\hp\\Documents\\NetBeansProjects\\s_heladeria\\src\\imagenes\\co.jpg");
this.setIconImage(icono.getImage());
}void limpi(){
id.setText("");
tp.setText("");
pr.setText("");
tam.setText("");
cant.setText("");
mar.setText("");
des.setText("");
fe.setText("DD-MM-AAAA");
fi.setText("DD-MM-AAAA");
bus.setText("");
}void bloq(){
id.setEnabled(false);
tp.setEnabled(false);
pr.setEnabled(false);
tam.setEnabled(false);
cant.setEnabled(false);
mar.setEnabled(false);
des.setEnabled(false);
fe.setEnabled(false);
fi.setEnabled(false);
nuevo.setEnabled(true);
guardar.setEnabled(true);
}void desbloquear(){
id.setEnabled(true);
tp.setEnabled(true);
pr.setEnabled(true);
tam.setEnabled(true);
cant.setEnabled(true);
mar.setEnabled(true);
des.setEnabled(true);
fe.setEnabled(true);
fi.setEnabled(true);
nuevo.setEnabled(false);
guardar.setEnabled(true);
}void mostrar(){
DefaultTableModel modelo = new DefaultTableModel();
modelo.addColumn("CODIGO");
modelo.addColumn("TIPO");
modelo.addColumn("DESCRIPCION");
modelo.addColumn("PRECIO");
modelo.addColumn("TAMAÑO");
modelo.addColumn("CANTIDAD");
modelo.addColumn("MARCA");
modelo.addColumn("FECHA EXPIRACION");
modelo.addColumn("FECHA INGRESO");
produc.setModel(modelo);
String sql ="SELECT * FROM producto";
String datos[] = new String [9];
Statement st;
try {st = con.createStatement();
ResultSet rs = st.executeQuery(sql);
while(rs.next()){
datos[0] = rs.getString(2);
datos[1] = rs.getString(3);
datos[2] = rs.getString(4);
datos[3] = rs.getString(5);
datos[4] = rs.getString(6);
datos[6] = rs.getString(7);
datos[7] = rs.getString(8);
datos[8] = rs.getString(9);
modelo.addColumn(datos);
}produc.setModel(modelo);
} catch (SQLException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} }@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBackground(new java.awt.Color(0, 206, 206));
jLabel1.setFont(new java.awt.Font("Times New Roman", 0, 36)); // NOI18N
jLabel1.setForeground(new java.awt.Color(255, 204, 255));
jLabel1.setText("PRODUCTOS");
jLabel2.setText("CODIGO");
jLabel3.setText("TIPO");
fi.setText("DD-MM-AAAA");
fi.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
fiActionPerformed(evt);
}});
jLabel4.setText("PRECIO");
jLabel5.setText("TAMAÑO");
jLabel6.setText("CANTIDAD");
jLabel7.setText("DESCRPCION");
jLabel8.setText("FECHA DE EXPIRACION");
fe.setText("DD-MM-AAAA");
jLabel9.setText("MARCA");
jLabel10.setText("FECHA DE INGRESO");
nuevo.setText("NUEVO");
nuevo.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
nuevoActionPerformed(evt);
}});
guardar.setText("GUARDAR");
guardar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
guardarActionPerformed(evt);
}});
atras.setText("ATRAS");
atras.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
atrasActionPerformed(evt);
}});
salir.setText("SALIR");
salir.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
salirActionPerformed(evt);
}});
buscar.setText("BUSCAR");
buscar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buscarActionPerformed(evt);
}});
produc.setBackground(new java.awt.Color(0, 204, 204));
produc.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
produc.setForeground(new java.awt.Color(255, 255, 255));
produc.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
}));
jScrollPane1.setViewportView(produc);
mod.setText("MODIFICAR");
mod.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
modActionPerformed(evt);
}});
act.setText("ACTUALIZAR");
act.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
actActionPerformed(evt);
}});
elim.setText("ELIMINAR");
elim.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
elimActionPerformed(evt);
}});
pack();
}// </editor-fold>
public void consulta() {
desbloquear();
String cap="";
ResultSet rs = null; var2 = var;String sql2="Select * FROM producto where Codigo_producto = '"+var2+"'";
try {String url = "jdbc:mysql://localhost:3306/heladeria_inventario";
String usuario = "root";
String contraseña = "youandi123";
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection(url,usuario,contraseña);
if ( con != null )
System.out.println("Se ha establecido una conexión a la base de datos " +
"\n " + url );
stmt = con.createStatement();
rs = stmt.executeQuery(sql2);
int i=1;while ( rs.next() ) {
String cod = rs.getString("Codigo_producto");
String tip = rs.getString("tipo");
String dess = rs.getString("Decripcion");
String pre = rs.getString("precio");
String tama = rs.getString("Tamaño");
String canti = rs.getString("cantidad");
String marc = rs.getString("Marca");
String fex = rs.getString("fe");
String fin = rs.getString("fi");
System.out.println("Sitio Web "+ (i++) + ":\n"
+ cod + "\n"
+ tip + "\n"
+ dess + "\n"
+ pre + "\n"
+ tama + "\n"
+ canti + "\n"
+ marc + "\n"
+ fex + "\n"
+ fin + "\n\n" );
id.setText(cod);
tp.setText(tip);
des.setText(dess);
pr.setText(pre);
tam.setText(tama);
cant.setText(canti);
mar.setText(marc);
fe.setText(fex);
fi.setText(fin);
} }catch( SQLException ex ) {
ex.printStackTrace();
} catch (InstantiationException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} finally {if ( rs != null ) {
try {rs.close();
} catch( SQLException ex ) {
System.out.println( ex.getMessage());
ex.printStackTrace();
} }if ( stmt != null ) {
try {stmt.close();
} catch( SQLException ex ) {
System.out.println( ex.getMessage());
ex.printStackTrace();
} }if ( con != null ) {
try {con.close();
} catch( SQLException ex ) {
System.out.println( ex.getMessage());
ex.printStackTrace();
} } } }private void fiActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}private void nuevoActionPerformed(java.awt.event.ActionEvent evt) {
desbloquear();
id.requestFocus();
}private void salirActionPerformed(java.awt.event.ActionEvent evt) {
this.dispose();
}private void atrasActionPerformed(java.awt.event.ActionEvent evt) {
frmbienvenido f= new frmbienvenido();
f.setVisible(true);
dispose();
}private void guardarActionPerformed(java.awt.event.ActionEvent evt) {
String cadena2,cadena3,cadena4,cadena5,cadena6,cadena7,cadena8,cadena9,cadena10;
cadena2 = id.getText();
cadena3 = tp.getText();
cadena4 = des.getText();
cadena5 = pr.getText();
cadena6 = tam.getText();
cadena7 = cant.getText();
cadena8 = mar.getText();
cadena9 = fe.getText();
cadena10 = fi.getText();
if ((pr.getText().equals("")) || (tp.getText().equals("")) || (pr.getText().equals("")) || (tam.getText().equals(""))
|| (mar.getText().equals("")) || (cant.getText().equals("")) || (des.getText().equals("")) || (fe.getText().equals(""))
|| (fi.getText().equals(""))) {
javax.swing.JOptionPane.showMessageDialog(this,"Debe llenar todos los campos \n","AVISO!",javax.swing.JOptionPane.INFORMATION_MESSAGE);
tp.requestFocus();
} else { try {String url = "jdbc:mysql://localhost:3306/heladeria_inventario";
String usuario = "root";
String contraseña = "youandi123";
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection(url,usuario,contraseña);
if ( con != null )
System.out.println("Se ha establecido una conexión a la base de datos " +
"\n " + url );
stmt = con.createStatement();
stmt.executeUpdate("INSERT INTO producto VALUES('"+cadena2+"','"+cadena3+"','"+cadena4+"','"+cadena5+"','"+cadena6+"','"+cadena7+"','"+cadena8+"','"+cadena9+"','"+cadena10+"')");
System.out.println("Los valores han sido agregados a la base de datos ");
} catch (InstantiationException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} catch (SQLException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} finally {if (con != null) {
try {con.close();
stmt.close();
} catch ( SQLException e ) {
System.out.println( e.getMessage());
} } }javax.swing.JOptionPane.showMessageDialog(this,"Registro exitoso! \n","AVISO!",javax.swing.JOptionPane.INFORMATION_MESSAGE);
}limpi();
}private void buscarActionPerformed(java.awt.event.ActionEvent evt) {
String cap="";
ResultSet rs = null;var = javax.swing.JOptionPane.showInputDialog(this,"Codigo del producto","BUSCAR",javax.swing.JOptionPane.QUESTION_MESSAGE);
String sql="SELECT* FROM producto WHERE Codigo_producto = '"+var+"'";
if(var == null)
javax.swing.JOptionPane.showMessageDialog(this,"La accion fue cancelada","AVISO!",javax.swing.JOptionPane.INFORMATION_MESSAGE);
else {if (var.equals("")) {
javax.swing.JOptionPane.showMessageDialog(this,"Favor de ingresar el codigo del \n del productoque desea consultar","AVISO!",javax.swing.JOptionPane.INFORMATION_MESSAGE);
} else { try {String url = "jdbc:mysql://localhost:3306/heladeria_inventario";
String usuario = "root";
String contraseña = "youandi123";
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection(url,usuario,contraseña);
if ( con != null )
System.out.println("Se ha establecido una conexión a la base de datos " +
"\n " + url );
stmt = con.createStatement();
rs = stmt.executeQuery(sql);
while(rs.next()) {
cap = rs.getString("tipo");
if (cap.equals("aderezo") || cap.equals("cono") || cap.equals("elaboracion") ) {
consulta();
}} // fin del bucle While
} catch (InstantiationException | IllegalAccessException | ClassNotFoundException | SQLException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} finally {if (con != null) {
try {con.close();
stmt.close();
} catch ( Exception e ) {
System.out.println( e.getMessage());
} } }if (!cap.equals("aderezo") && !cap.equals("cono") && !cap.equals("elaboracion")) {
javax.swing.JOptionPane.showMessageDialog(this,"El usuario no fue encontrado\n","ERROR!", javax.swing.JOptionPane.ERROR_MESSAGE);
} } } }private void modActionPerformed(java.awt.event.ActionEvent evt) {
int fila = produc.getSelectedRow();
if(fila>=0){
bus.setText(produc.getValueAt(fila, 0).toString());
id.setText(produc.getValueAt(fila, 1).toString());
tp.setText(produc.getValueAt(fila, 2).toString());
des.setText(produc.getValueAt(fila, 3).toString());
pr.setText(produc.getValueAt(fila, 4).toString());
tam.setText(produc.getValueAt(fila, 5).toString());
cant.setText(produc.getValueAt(fila, 6).toString());
mar.setText(produc.getValueAt(fila, 7).toString());
fe.setText(produc.getValueAt(fila, 8).toString());
fi.setText(produc.getValueAt(fila, 9).toString());
} else {JOptionPane.showMessageDialog(null, "Fila no seleccionada");
} }private void actActionPerformed(java.awt.event.ActionEvent evt) {
try {PreparedStatement pps;
pps = con.prepareStatement("UPDATE producto SET Codigo_producto='"+id.getText()+"', tipo='"+tp.getText()+"', Decripcion='"+des.getText()+"', precio='"+pr.getText()+"', Tamaño='"+tam.getText()+"', cantidad='"+cant.getText()+"', Marca='"
+mar.getText()+"', fe='"+fe.getText()+"', fi='"+fi.getText()+"' WHERE Codigo_producto ='"+bus.getText()+"'" );
pps.executeUpdate();
JOptionPane.showMessageDialog(null, "Datos actualizados");
limpi();
mostrar();
} catch (SQLException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} }private void elimActionPerformed(java.awt.event.ActionEvent evt) {
int fila=produc.getSelectedRow();
String valor = produc.getValueAt(fila, 0).toString();
if(fila>=0){
try {PreparedStatement pps = con.prepareStatement("DELETE FROM producto WHERE Codigo_producto='"+valor+"'");
JOptionPane.showMessageDialog(null, "Dato eliminado");
} catch (SQLException ex) {
Logger.getLogger(Producto.class.getName()).log(Level.SEVERE, null, ex);
} } }ERROR
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at clases.Producto.mostrar(Producto.java:94)
at clases.Producto.<init>(Producto.java:25)
at clases.Producto.lambda$main$0(Producto.java:729)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
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)
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