Java.lang.nullpointerexception

[Matheus Alves da Silva]

Gente estou tendo problemas em meu código java, estou usando o Form JFrame para criar uma tela de Login e senha, mas sempre que digito esses campo o NetBeans mostra esse tal de java.lang.NullPointerException. Estou errando em alguma coisa? vou mandar o código das duas classes abaixo:

 

Classe FábricaDeConexao

package br.com.loginteste.conexao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.swing.JOptionPane;
/**
 *
 * @author Matheus
 */
public class FabricaDeConexao {
    public Connection con;
    public Statement stmt;
    public ResultSet rs;

    String url = "jdbc:mysql://localhost:3306/testelogin";
    String driver = "com.mysql.jdbc.Driver";
    String user = "root";
    String password = "root";
    
    public void abrirConexao(){
        try {
             Class.forName(driver).newInstance();
        con = DriverManager.getConnection(url, user, password);
        
        stmt = con.createStatement();
            
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, "Erro na conexão do banco de dados","Erro",
                    JOptionPane.ERROR_MESSAGE, null);
        }
       
    }
    /**
    public static void main(String[] args){
        FabricaDeConexao fab = new FabricaDeConexao();
        fab.abrirConexao();
    }*/
}

 

Classe Login

package br.com.loginteste.visao;

import br.com.loginteste.conexao.FabricaDeConexao;
import java.sql.SQLException;

import javax.swing.JOptionPane;

/**
 *
 * @author Matheus
 */
public class Login extends javax.swing.JFrame {

    /**
     * Creates new form Login
     */
    public Login() {
        initComponents();
    }
    
    
    public void acessarSistema(){
        
        try {
           FabricaDeConexao fab = new FabricaDeConexao();
        fab.abrirConexao();
        fab.stmt = fab.con.createStatement();
        
        String sql = "SELECT * FROM LOGIN";
        
        fab.rs.first();
        
        if(txtNome.getText().equals(fab.rs.getString("nome"))
                && ptxtSenha.getText().equals(fab.rs.getString("senha"))){
            JOptionPane.showMessageDialog(null, "Acesso Permitido");
        }else{
            JOptionPane.showMessageDialog(null, "Acesso Negado");
        }  
        } catch (SQLException e) {
        }
            
    }

    

    /**
     * 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();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        ptxtSenha = new javax.swing.JPasswordField();
        txtNome = new javax.swing.JTextField();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("Entrar");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("Sair");

        jLabel1.setText("Nome:");

        jLabel2.setText("Senha");

        ptxtSenha.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                ptxtSenhaActionPerformed(evt);
            }
        });

        txtNome.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtNomeActionPerformed(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()
                .addGap(48, 48, 48)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel2)
                    .addComponent(jLabel1)
                    .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(txtNome)
                    .addComponent(ptxtSenha, javax.swing.GroupLayout.DEFAULT_SIZE, 123, Short.MAX_VALUE)
                    .addComponent(jButton2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(82, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addGap(65, 65, 65)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(txtNome, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(23, 23, 23)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(ptxtSenha, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 89, Short.MAX_VALUE)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2))
                .addGap(38, 38, 38))
        );

        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.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void txtNomeActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
    }                                       

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        acessarSistema();
    }                                        

    private void ptxtSenhaActionPerformed(java.awt.event.ActionEvent evt) {                                          
        // TODO add your handling code here:
    }                                         

    /**
     * @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 ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Login().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPasswordField ptxtSenha;
    private javax.swing.JTextField txtNome;
    // End of variables declaration                   
}

 

 

[psykotico]

Primeiro: Sem o Trace da Exception fica complicado ... o NullPointer pode estar sendo lançado em qualquer lugar aí. Colabora ae kkkk

Segundo: todo NullPointer é um erro na criação do objeto. Veja a linha que está lançando a exceção e verifique onde esse objeto está sendo criado. Lá deve ser o erro.