将数据库中的数据显示到我的表中

Question

我需要帮助向我的数据库显示我的数据，并且我不断收到这些错误，请有人帮助显示代码和错误

import java.awt.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.ResultSet;

import javax.swing.*;
import javax.swing.table.*;

import net.proteanit.sql.DbUtils;

import javax.swing.JInternalFrame;

public class Form3 extends JInternalFrame {
private JButton button = new JButton("Button");
private JTable table = new JTable(new DefaultTableModel(100,11));
private javax.swing.JScrollPane jsp = new JScrollPane(table);

/**
 * Launch the application.
 */
Connection conn = null;


/**
 * Create the frame.
 */
public Form3() {
    super();
    setBounds(-10, -10, 600, 450);

    button.addActionListener(new ActionListener() {


        public void actionPerformed(ActionEvent argo) {
            try{
                String query1 = "SELECT * FROM csc3610_Connection.Oilform";
                java.sql.PreparedStatement pst1= conn.prepareStatement(query1);
                ResultSet rs = pst1.executeQuery();
                table.setModel(DbUtils.resultSetToTableModel(rs));

            }catch (Exception e){
                e.printStackTrace();
            }
        }
    });
    JPanel panel = new JPanel();
    panel.add(button);
    getContentPane().add(panel, BorderLayout.WEST);
    jsp.setBorder(BorderFactory.createLineBorder(Color.red));
    jsp.getViewport().setPreferredSize(new Dimension(500, 500));
    getContentPane().add(jsp, BorderLayout.CENTER);
    table.getColumnModel().getColumn(10).setPreferredWidth(6);
    table.setGridColor(Color.gray);
    }
   private void display() {
        JFrame f = new JFrame("TablePanel");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(this);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }


}

以下是我遇到的错误请帮助我。我不知道这些错误是什么意思，它让我成功。

java.lang.NullPointerException
at guii.Form3$1.actionPerformed(Form3.java:39)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
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:6525)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6290)
at java.awt.Container.processEvent(Container.java:2234)
at java.awt.Component.dispatchEventImpl(Component.java:4881)
at java.awt.Container.dispatchEventImpl(Container.java:2292)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
at java.awt.Container.dispatchEventImpl(Container.java:2278)
at java.awt.Window.dispatchEventImpl(Window.java:2739)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:719)
at java.awt.EventQueue$4.run(EventQueue.java:717)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
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)