Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

Alvaro_da_silva_facn · Setembro 24, 2018, 3:06am

Ola, gostaria que me ajudassem a resolver um problema abaixo:
Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException
at javax.swing.ImageIcon.(ImageIcon.java:217)
at br.com.infox.telas.TelaLogin.initComponents(TelaLogin.java:90)
at br.com.infox.telas.TelaLogin.(TelaLogin.java:46)
at br.com.infox.telas.TelaLogin$2.run(TelaLogin.java:190)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
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:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
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)

O erro não permite a execução do Jframe no netbeans, e não sei onde eu errei.

Código do programa:

package br.com.infox.telas;

import java.sql.*;//Chamar biblioteca sql em cada form
import br.com.infox.dal.ModuloConexao; //Chamar modulo conexao em cada form
import javax.swing.JOptionPane;

/**
*

@author Alvaro Silva
*/
public class TelaLogin extends javax.swing.JFrame {

Connection conexao = null; //Frame
PreparedStatement pst = null; // Frame
ResultSet rs = null; //Frame

public void logar() {
String sql = “select * from tblUsuario where login=? and senha = ?”;//Metodo para procurar no banco
try {
pst = conexao.prepareStatement(sql);// faz a consulta das info no banco
pst.setString(1, txtUsuario.getText());//Recebe as info e sao comparadas com as info do campo
pst.setString(2, txtSenha.getText());//a mesma coisa de cima
rs = pst.executeQuery();//faz a execução da consulta
```
     if (rs.next()) { //caso usuario e senha existir ele mostra a tela principal
         TelaPrincipal principal = new TelaPrincipal();
         principal.setVisible(true);
         
     } else {
         JOptionPane.showMessageDialog(null, "Usuario ou senha incorretos!");
     }
 } catch (Exception e) {
     JOptionPane.showMessageDialog(null, e);//caso conexao falha
 }
```
}

/**
- Creates new form TelaLogin
  */
  public TelaLogin() {
  initComponents();
  conexao = ModuloConexao.conector(); //Chamar o conector do modulo
  System.out.println(conexao);
  // Mostra a conexao para o usuario
  if (conexao != null) {
```
 Status.setText("conctado");
```
  } else {
  Status.setText(“Nao conectado”);
  }
}

/**
- 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”)
  //
  private void initComponents() {
  
  jPanel1 = new javax.swing.JPanel();
  jLabel1 = new javax.swing.JLabel();
  jLabel2 = new javax.swing.JLabel();
  txtUsuario = new javax.swing.JTextField();
  txtSenha = new javax.swing.JPasswordField();
  btnLogin = new javax.swing.JButton();
  lblStatus = new javax.swing.JLabel();
  Status = new javax.swing.JLabel();
  
  setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
  
  jLabel1.setText(“Usuário”);
  
  jLabel2.setText(“Senha”);
  
  btnLogin.setText(“Login”);
  btnLogin.addActionListener(new java.awt.event.ActionListener() {
  public void actionPerformed(java.awt.event.ActionEvent evt) {
  btnLoginActionPerformed(evt);
  }
  });
  
  lblStatus.setIcon(new javax.swing.ImageIcon(getClass().getResource("/br/com/infox/icon/DbOk.png"))); // NOI18N
  
  Status.setIcon(new javax.swing.ImageIcon(getClass().getResource("/br/com/infox/icones/DbOk.png"))); // NOI18N
  
  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(38, 38, 38)
  .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE)
  .addComponent(lblStatus)
  .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE)
  .addComponent(Status))
  .addGap(74, 74, 74)
  .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
  .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  .addComponent(txtSenha, javax.swing.GroupLayout.PREFERRED_SIZE, 270, javax.swing.GroupLayout.PREFERRED_SIZE)
  .addComponent(txtUsuario, javax.swing.GroupLayout.PREFERRED_SIZE, 270, javax.swing.GroupLayout.PREFERRED_SIZE))
  .addComponent(btnLogin, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE))
  .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
  );
  jPanel1Layout.setVerticalGroup(
  jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  .addGroup(jPanel1Layout.createSequentialGroup()
  .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  .addGroup(jPanel1Layout.createSequentialGroup()
  .addGap(36, 36, 36)
  .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
  .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
  .addComponent(txtUsuario, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE))
  .addGap(9, 9, 9)
  .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
  .addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
  .addComponent(txtSenha, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE))
  .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 30, Short.MAX_VALUE)
  .addComponent(Status))
  .addGroup(jPanel1Layout.createSequentialGroup()
  .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
  .addComponent(btnLogin, javax.swing.GroupLayout.PREFERRED_SIZE, 36, javax.swing.GroupLayout.PREFERRED_SIZE)))
  .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
  .addComponent(lblStatus)
  .addContainerGap(119, Short.MAX_VALUE))
  );
  
  javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
  getContentPane().setLayout(layout);
  layout.setHorizontalGroup(
  layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  .addComponent(jPanel1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
  );
  layout.setVerticalGroup(
  layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  .addGroup(layout.createSequentialGroup()
  .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
  .addGap(0, 25, Short.MAX_VALUE))
  );
  
  jPanel1.getAccessibleContext().setAccessibleName(“X System - Login”);
  
  pack();
  }//
private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
logar();//Chama o metodo criado no botao

}

/**
- @param args the command line arguments
  /
  public static void main(String args[]) {
  / Set the Nimbus look and feel /
  //
  / 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(TelaLogin.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
    java.util.logging.Logger.getLogger(TelaLogin.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
    java.util.logging.Logger.getLogger(TelaLogin.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
    java.util.logging.Logger.getLogger(TelaLogin.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //
  /* Create and display the form */
  java.awt.EventQueue.invokeLater(new Runnable() {
  public void run() {
  new TelaLogin().setVisible(true);
  }
  });
  }
// Variables declaration - do not modify
private javax.swing.JLabel Status;
private javax.swing.JButton btnLogin;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel lblStatus;
private javax.swing.JPasswordField txtSenha;
private javax.swing.JTextField txtUsuario;
// End of variables declaration
}

rodriguesabner · Setembro 24, 2018, 4:17am

Você trocou ou excluiu alguma foto/ícone do seu jframe? Tá falando que não achou o que vc setou. Vai na linha 90 e vê se o que ela tá indicando

Alvaro_da_silva_facn · Setembro 25, 2018, 3:00am

Sim mudei o icone e apareceu esse erro. Fui lá na nalinha indicada e apareceu isso:

lblStatus.setIcon(new javax.swing.ImageIcon(getClass().getResource("/br/com/infox/icon/DbOk.png"))); // NOI18N

    Status.setIcon(new javax.swing.ImageIcon(getClass().getResource("/br/com/infox/icones/DbOk.png"))); // **_NOI18N_**

o que eu poderia fazer?

rodriguesabner · Setembro 25, 2018, 4:54am

Essa imagem existe mesmo? Vê se você deixou o ícone no GUI do Java. Vai na aba Design, clica em cima desse Status, depois clica com o botão direito, propriedades. Vê se tá linkando pra algum ícone

Alvaro_da_silva_facn · Setembro 25, 2018, 5:01am

Sim ele esta linkando para o icone

rodriguesabner · Setembro 25, 2018, 2:20pm

Mas está linkando certo? Apaga o código e deixa só pela GUI

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

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