java.lang.NullPointerException 예외 오류

-1

netbeans에서 JFrame을 실행 중이지만 해결할 수없는 오류가 발생합니다. 완전한 자바 코드를 실행 한 후java.lang.NullPointerException 예외 오류

@EJB 
private static displaysSessionBeanRemote displaysSessionBean; 

@EJB 
private static codesGenerateSessionBeanRemote codesGenerateSessionBean; 
    String str1; 
    String str2; 
    String str3; 
    String str4; 
    String str5;  
String m = codesGenerateSessionBean.businessMethod(str1,str2,str3,str4,str5); 
public NewJFrame() { 

    this.str1 = serverName.getText(); 
    this.str2 = userName.getText(); 
    this.str3 = password.getText(); 
    this.str4 = databaseName.getText(); 
    this.str2 = tableName.getText(); 

    initComponents(); 
} 

@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code">       
private void initComponents() { 

    jLabel1 = new javax.swing.JLabel(); 
    serverName = new javax.swing.JTextField(); 
    jLabel2 = new javax.swing.JLabel(); 
    userName = new javax.swing.JTextField(); 
    jLabel3 = new javax.swing.JLabel(); 
    password = new javax.swing.JTextField(); 
    databaseName = new javax.swing.JTextField(); 
    jLabel4 = new javax.swing.JLabel(); 
    tableName = new javax.swing.JTextField(); 
    jLabel5 = new javax.swing.JLabel(); 
    jButton1 = new javax.swing.JButton(); 
    jScrollPane1 = new javax.swing.JScrollPane(); 
    jTextArea1 = new javax.swing.JTextArea(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

    jLabel1.setText("Server Name"); 

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

    jLabel2.setText("User Name"); 

    jLabel3.setText("Password"); 

    jLabel4.setText("Database name"); 

    jLabel5.setText("Table name"); 

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

    jTextArea1.setColumns(20); 
    jTextArea1.setRows(5); 
    jTextArea1.addComponentListener(new java.awt.event.ComponentAdapter() { 
     public void componentShown(java.awt.event.ComponentEvent evt) { 
      jTextArea1ComponentShown(evt); 
     } 
    }); 
    jScrollPane1.setViewportView(jTextArea1); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGap(33, 33, 33) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addComponent(jLabel1) 
       .addComponent(jLabel2) 
       .addComponent(jLabel3) 
       .addComponent(jLabel4) 
       .addComponent(jLabel5)) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 136, Short.MAX_VALUE) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) 
       .addComponent(tableName) 
       .addComponent(databaseName) 
       .addComponent(password) 
       .addComponent(userName) 
       .addComponent(serverName, javax.swing.GroupLayout.DEFAULT_SIZE, 124, Short.MAX_VALUE)) 
      .addGap(18, 18, 18) 
      .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 319, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap()) 
     .addGroup(layout.createSequentialGroup() 
      .addGap(93, 93, 93) 
      .addComponent(jButton1) 
      .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addContainerGap() 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(jLabel1) 
         .addComponent(serverName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGap(18, 18, 18) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(jLabel2) 
         .addComponent(userName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGap(18, 18, 18) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(jLabel3) 
         .addComponent(password, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGap(18, 18, 18) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(jLabel4) 
         .addComponent(databaseName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGap(18, 18, 18) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(jLabel5) 
         .addComponent(tableName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGap(18, 18, 18) 
        .addComponent(jButton1)) 
       .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 178, javax.swing.GroupLayout.PREFERRED_SIZE)) 
      .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
    ); 

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

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

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {           
    // TODO add your handling code here: 
}           

private void jTextArea1ComponentShown(java.awt.event.ComponentEvent evt) {           
    jTextArea1.setText(String.valueOf((m))); 
}           
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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(NewJFrame.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 NewJFrame().setVisible(true); 
     } 
    }); 
} 

// Variables declaration - do not modify      
private javax.swing.JTextField databaseName; 
private javax.swing.JButton jButton1; 
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.JScrollPane jScrollPane1; 
private javax.swing.JTextArea jTextArea1; 
private javax.swing.JTextField password; 
private javax.swing.JTextField serverName; 
private javax.swing.JTextField tableName; 
private javax.swing.JTextField userName; 
// End of variables declaration

}

아래에 주어진이 내가 자바 언어에 여전히 새로운 오전으로 내가

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException 
    at NewJFrame.<init>(NewJFrame.java:20) 
    at NewJFrame$4.run(NewJFrame.java:189) 
    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)

를 얻을 오류가 친절하게 도와입니다

출처

2016-10-24 Quasay quantay

경우 코드의 라인 189인가? 여기 과거? –

이 줄에서 this.str2 = tableName.getText(); 이게되어야합니다 .str5, 그것을 확인하십시오 –

여기 내 라인이 간다 189 코드 : new NewJFrame(). setVisible (true); –

변경

 this.str2 = tableName.getText();

우선 들어

this.str5 = tableName.getText();

출처

2016-10-24 18:40:28

Thanks @Aammad. 방금 변경 했는데도 여전히 같은 오류가 있습니다. –

에,이 :

this.str1 = serverName.getText(); 
this.str2 = userName.getText(); 
this.str3 = password.getText(); 
this.str4 = databaseName.getText(); 
this.str2 = tableName.getText(); 

initComponents();

대신해야합니다

initComponents(); // make the components something other than null 

this.str1 = serverName.getText(); 
this.str2 = userName.getText(); 
this.str3 = password.getText(); 
this.str4 = databaseName.getText(); 
this.str2 = tableName.getText();

출처

2016-10-24 19:03:24

java.lang.NullPointerException 예외 오류

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