Problem writing to a file on a shared drive

Question

I am having problems with my application not writing to a file on a shared drive. Actually it works perfect on one computer, but not on any other computer. Any ideas on why this would not work. Here is my code below, I think this may be an issue with permissions on the shared drive but have played with those until I am sick of it and nothing works. Any help on getting it to write to a file on a shared drive would be great.
report2 = new JButton("Provider Order Entry");
                    report2.addActionListener(new ActionListener() {
                         public void actionPerformed (ActionEvent e) {
                              if (e.getSource() == report2) {
                                   try {
                                        File file = new File("z:\\Provider Order Entry Reports\\ACCESSFILE.RMD");
                                        FileReader checkAccess = new FileReader(file);
                                        BufferedReader checkAccessBuff = new BufferedReader(checkAccess);
                                        boolean eof = false;
                                        while (!eof) {
                                             String line = checkAccessBuff.readLine();
                                             if (line != null) {
                                                  eof = true;
                                                  checkAccess.close();
                                                  checkAccessBuff.close();
                                                  if (!poeSelectionWindow.isShowing()) {
                                                       poeSelectionWindow.setSize(575, 200);
                                                       poeSelectionWindow.setBackground(blue);
                                                       JFrame.setDefaultLookAndFeelDecorated(false);
                                                       poeSelectionWindow.setVisible(true);
                                                  else if (poeSelectionWindow.isShowing()) {
                                                       poeSelectionWindow.setVisible(false);
                                   catch (IOException error) {
                                        Component controllingFrame = null;
                                        JOptionPane.showMessageDialog(controllingFrame,
                                                   "YOU DO NOT HAVE ACCESS TO THIS OPTION" + "\n" +
                                                   "PLEASE CONTACT IRM SUPPORT TO REQUEST ACCESS ",
                                                   "ACCESS DENIED",
                                                   JOptionPane.ERROR_MESSAGE);
                                        try {
                                             File errorFile = new File("Z:\\LOG\\LOGGER.log");
                                             String username = System.getProperty("user.name");
                                             InetAddress addr = InetAddress.getLocalHost();
                                             Date date = new Date();
                                             BufferedWriter bw = new BufferedWriter(new FileWriter(errorFile, true));
                                           bw.write("ACCESS ATTEMPTED ON: Provider Order Entry Report BY:" + username + " At Workstation/IP: "
                                                     + addr + " " + date);
                                           bw.newLine();
                                           bw.flush();
                                           bw.close();
                                        catch (IOException error1) {
                                             System.out.println("Error-- " + error1.toString());
                                        catch (NullPointerException NPE) {
                                             System.out.println("Error -- " + NPE.toString());                                                       
                                   catch (NullPointerException NPE) {
                                        System.out.println("Error -- " + NPE.toString());                                                       
                    });

Answer 1

So how do I stop the
NPE from occurring.By not dereferencing a null reference.
Thingamabob xyz = doSomethingWhichMightReturnNull();
if (xyz != null)
// go ahead and use xyz here
If you leave out the above "if" statement check, and just willy-nilly try to use xyz when it is null, you'll get the NPE.
It is occurring on the file
name. I have never been able to stop the file name
from throwing a NPE.I don't know how that translates to some lines of your code.