evt java netbeansでエラーが発生しました

Question

私はこの部分でエラーが発生したと思います。しかし、私はそれを修復することを知らない。エラーの結果は

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException 
    at bismillahpata.View.hitungHPP1.selanjutnyaActionPerformed(hitungHPP1.java:381) 
    at bismillahpata.View.hitungHPP1.access$800(hitungHPP1.java:28) 
    at bismillahpata.View.hitungHPP1$9.actionPerformed(hitungHPP1.java:330) 
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) 
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) 
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) 
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) 
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) 
    at java.awt.Component.processMouseEvent(Component.java:6505) 
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) 
    at java.awt.Component.processEvent(Component.java:6270) 
    at java.awt.Container.processEvent(Container.java:2229) 
    at java.awt.Component.dispatchEventImpl(Component.java:4861) 
    at java.awt.Container.dispatchEventImpl(Container.java:2287) 
    at java.awt.Component.dispatchEvent(Component.java:4687) 
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832) 
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492) 
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422) 
    at java.awt.Container.dispatchEventImpl(Container.java:2273) 
    at java.awt.Window.dispatchEventImpl(Window.java:2713) 
    at java.awt.Component.dispatchEvent(Component.java:4687) 
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707) 
    at java.awt.EventQueue.access$000(EventQueue.java:101) 
    at java.awt.EventQueue$3.run(EventQueue.java:666) 
    at java.awt.EventQueue$3.run(EventQueue.java:664) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) 
    at java.awt.EventQueue$4.run(EventQueue.java:680) 
    at java.awt.EventQueue$4.run(EventQueue.java:678) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:677) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105) 
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) 

であり、この私のコード

private void selanjutnyaActionPerformed(java.awt.event.ActionEvent evt) {            
     String namaProduk = this.fieldNamaProduk.getText(); 
     double totalProduk = Double.parseDouble(fieldTotalProduk.getText()); 

     produk p = new produk(); 
     p.setNamaProduk(namaProduk); 
     p.setJumlah(totalProduk); 

     produkController pc = new produkController(); 

     int res = pc.insertProduct(p); 
     if (res > 0){ 
      new hitungHPP(namaProduk, totalProduk).setVisible(true); 
      this.dispose(); 
     }else{ 
      JOptionPane.showMessageDialog(null, "Perintah Gagal, silahkan isi ulang!"); 
     } 
     totalHargaBahan = totalHargaBahan + total; 
     System.out.println(totalHargaBahan); 

    } 

Answer 1

あなたはコードでトライキャッチを使用する必要があり、

private void selanjutnyaActionPerformed(java.awt.event.ActionEvent evt) {            
     String namaProduk = this.fieldNamaProduk.getText(); 
     double totalProduk = Double.parseDouble(fieldTotalProduk.getText()); 

     produk p = new produk(); 
     p.setNamaProduk(namaProduk); 
     p.setJumlah(totalProduk); 

     produkController pc = new produkController(); 

     int res = pc.insertProduct(p); 
     if (res > 0){ 
      try{ 
       new hitungHPP(namaProduk, totalProduk).setVisible(true); 
       this.dispose(); 
       } 
      catch(Exception e) 
       { 
       System.out.println(e); 
       } 
     }else{ 
      JOptionPane.showMessageDialog(null, "Perintah Gagal, silahkan isi ulang!"); 
     } 
     totalHargaBahan = totalHargaBahan + total; 
     System.out.println(totalHargaBahan); 

    }