Ich habe Fehler in evt Java Netbeans

Question

denke ich, die ich in diesem Teil einen Fehler bekam. Aber ich weiß nicht, es zu reparieren. Das Ergebnis des Fehlers ist

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) 

und dies ist mein Code

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

Sie haben mit Code try catch verwenden,

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); 

    }