Hi everyone!

In my code when I click on the "Show Results" button it shows me the result is a table in another interface other than the main interface, untel now everything is fine but when I changed the method : I just want to show this table in the main interface, I created a new panel and all, the problem is a problem of showing this table in this panel so here: the code of the panel:

JPanel panel_4 = new JPanel();
 panel_4.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
 panel_4.setBounds(115, 510, 450, 130);
 getContentPane().add(panel_4);
 panel_4.setLayout(null);
 JLabel lblNewLabel = new JLabel("Resource Aware Planning Results" );
 lblNewLabel.setFont(new Font("Times New Roman", Font.BOLD | Font.ITALIC, 14));
 lblNewLabel.setBounds(125, 11, 236, 14);
 panel_4.add(lblNewLabel);
 JScrollPane scrollPane1 = new JScrollPane();
 scrollPane1.setBounds(66, 55, 312, 49);
 panel_4.add(scrollPane1);
 table = new JTable();
 scrollPane1.setViewportView(table);
 DefaultTableModel modelres = new DefaultTableModel();
 modelres.setRowCount(1);
 DefaultTableModel modelres1 = new DefaultTableModel();
 modelres1.setRowCount(1);

and here is the Show Results button code:

if ( radio3.isSelected())
 {
 for(int i=0; i<n;i++)
    {
    //int k=i+1;
    String object = "T"+i;
    modelres.addColumn(object);// modelres est globale ainsi que modelres1
    int index=plan.NodeIndex(i, res, m);
    object="N"+index;
    modelres.setValueAt(object, 0, i);
    }
  table.setModel(modelres);
 //resultsFrame.setVisible(true);
 }
 else if ( radio4.isSelected())
 {
    for(int i=0; i<n;i++)
    {
   //int k=i+1;
   String object = "T"+i;
   modelres1.addColumn(object);
   int index=plan.NodeIndex(i, res, m);
   object="N"+index;
   modelres1.setValueAt(object, 0, i);
    }
   table.setModel(modelres1);
    //resultsFrame.setVisible(true);
     }

and it shows me this error:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at projetPFE.GUI2.btnShowResults(GUI2.java:978)
at projetPFE.GUI2$5.actionPerformed(GUI2.java:363)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

I honestly do not know how to fix this error
I'll be very grateful if you can help me
Thank you in advance

The exception message identifies the exact line where the NPE happened, but we don't have the original file to interpret the line number. What is the code on line 978?

That looks like modelres is null (not initialised). I see the code where it is defined and initialised, so maybe there is a duplicate definition somewhere?

This article has been dead for over six months. Start a new discussion instead.