Clearly the stack trace tells you that fcButtonPanel has not been created when you attempted to set the preferred size on it in 'startInstall()'
Gregory, Carlton wrote:
Can anyone tell me why my Listener InstallListener is raising a NullPointerException when I press my okbutton? /* * Copyright ©. */
import java.io.*; import java.util.*; import javax.swing.*; import java.awt.event.*; import java.awt.Graphics; import java.awt.*;
/**
* @author cgregory
*/
public class SamsInstaller //implements Observer
{
JButton okbutton;
JButton cnbutton;
JButton openButton;
JButton closebutton;
JFrame installerFrame;
JPanel installPanel;
JPanel installContentPane;
JPanel fcPanel;
JPanel fcButtonPanel;
JPanel buttonPanel;
JTextArea log;
JTextArea instructions;
JFileChooser fc;
InstallListener instlisnr;
public SamsInstaller()
{
installerFrame = new JFrame("SAMS9 DIICOE Installer");
installContentPane = new JPanel();
installPanel = new JPanel();
okbutton = new JButton("OK");
cnbutton = new JButton("CANCEL");
JLabel introLabel = new JLabel("SAMS9 Database Installation \n" +
"Space and Naval Warfare Systems
Center Norfolk \n" +
" (SPAWARSYSCEN)
");
okbutton.addActionListener(new InstallListener());
cnbutton.addActionListener(new InstallListener());
installerFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
installPanel.setLayout(new GridBagLayout());
GridBagConstraints BagConstrnts = new GridBagConstraints();
buttonPanel = new JPanel();
buttonPanel.add(okbutton);
buttonPanel.add(cnbutton);
installPanel.setBorder(BorderFactory.createRaisedBevelBorder());
Insets myinset = new Insets(0,0,0,0);
BagConstrnts.anchor = BagConstrnts.CENTER;
BagConstrnts.insets = new Insets(0,10,0,0);
BagConstrnts.gridx = 0;
BagConstrnts.gridy = 0;
BagConstrnts.gridwidth = 2;
BagConstrnts.ipady = 40; installPanel.add(introLabel,BagConstrnts);
BagConstrnts.gridx = 0;
BagConstrnts.gridy = 4;
BagConstrnts.ipady = 0;
BagConstrnts.gridwidth = 0; installPanel.add(buttonPanel,BagConstrnts);
installContentPane.setOpaque(true);
installContentPane.add(installPanel);
installerFrame.setContentPane(installContentPane);
installerFrame.setSize(800,300);
installerFrame.setVisible(true);
}
//public void update(Observable o, Object str) //{
//}
public void startInstall()
{
//Create the log first, because the action listeners
//need to refer to it.
log = new JTextArea(5,20);
log.setMargin(new Insets(5,5,5,5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);
//Place instructions of what to do instructions = new JTextArea("Please select the directory were your
Oracle " +
"For example
\"C:\\oracle\\oradata\\samsdb\"",5,30);
instructions.setBackground(Color.lightGray);
instructions.setLineWrap(true);
JPanel instrPanel = new JPanel();
//Create a Label that will be invisible to create space
//JLabel invisibleLabel = new JLabel();
//invisibleLabel.setVisible(false);
//Create a file chooser
fc = new JFileChooser();
fc.setDialogTitle("Select Data Directory");
//Uncomment one of the following lines to try a different
//file selection mode. The first allows just directories
//to be selected (and, at least in the Java look and feel,
//shown). The second allows both files and directories
//to be selected. If you leave these lines commented out,
//then the default mode (FILES_ONLY) will be used.
//
fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
//fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
//Create the open button. We use the image from the JLF
//Graphics Repository (but we extracted it from the jar).
openButton = new JButton("Select a Directory");
openButton.addActionListener(new FileChooseLisnr());
fcPanel = new JPanel(new BorderLayout());
fcButtonPanel.setPreferredSize(new Dimension(300,150));
fcButtonPanel.add(openButton);
//fcButtonPanel.add(invisibleLabel);
fcButtonPanel.add(logScrollPane);
fcButtonPanel.setLayout(new
BoxLayout(fcButtonPanel,BoxLayout.Y_AXIS));
Dimension PaneDim = new Dimension(700,150);
instrPanel.add(instructions);
fcPanel.add(fcButtonPanel,BorderLayout.LINE_END);
fcPanel.add(instrPanel, BorderLayout.CENTER);
fcPanel.setMinimumSize(PaneDim);
fcPanel.setPreferredSize(PaneDim);
installContentPane.setPreferredSize(PaneDim);
installContentPane.add(fcPanel);
installerFrame.setSize(600,300);
}
public static void main(String[] args)
{
SamsInstaller installerInstance = new SamsInstaller();
}
class FileChooseLisnr implements ActionListener {
public void actionPerformed(ActionEvent event) {
if (event.getSource() == openButton)
{
int returnVal = fc.showDialog(fcPanel, "Set Data Dir");
if (returnVal == JFileChooser.APPROVE_OPTION)
{
System.out.println(fc.getSelectedFile());
}
} }
}
class InstallListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
if (event.getSource().equals(cnbutton))
{
System.exit(0);
}
else
{
installPanel.setVisible(false);
startInstall();
}
}
}
}
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