How do I set a breakpoint in a Java Server page (.jsp)?

I have set up an application for remote debugging and am able to connect to it from JDeveloper. When the code execution comes to breakpoints that I have set in java (.java) files they work and the application stops so I can debug etc.
This also applies to breakpoints set in java code that is called from Java Server pages.
However if I set breakpoints directly in a java server page whether it is in html code or in java code (such as scriplets) the execution does not stop and the breakpoints are ignored.
Why? Is there some extra thing I have to do? I have tried in Project Properties/Run/Debug/Profile/Edit/Launch Settings to choose server as Virtual Machine for instance but that does not change anything.
Comment. I do not know if this is of interest but I am going to add some java server pages to an application and they are defined in a directory like this:
. . . src\org\yawlfoundation\yawl\resourcing\jsf\jsp
but when the tomcat deploys the .war file they end up here:
. . . apache-tomcat-6.0.18\webapps\resourceService
As I can find no package declaration in a .jsp file this should not matter but I mention it anyway.
Edited by: user10477024 on Nov 25, 2008 5:32 AM

Hi user10477024,
thanks for explaining your background on what you are trying to do and I do understand the approach you are taking. Unlike user10689900's completely random post.
I've tried to convey why there is no support for JSP debugging in JDev, but again the main reason is that the current frameworks do not code Java directly into a JSP. The JSP is purely used to position the components on the page aiding visual design and real Java classes in tag libs do the rest.
So the evolution has been:
Servlets (Java classes writing HTML logic and intermingling presentation and business logic)
JSP 1.0 JSP (HTML looking) files where you can add scriptlets enclosed in <% ... %> <- you are here
JSP 1.1 Introduction of Tags and Tag libraries, tag libraries are true java classes and the JSP controls layout and simpler more elegant design.
Really JSP 1.1 is all about building reusable components together in tag libraries that can be reused across pages and improving design by not mixing presentation and business logic code together.
If I had inherited something as you have, my advice (if you can) would be to code up some tag libraries because it would be a good learning experience and would be very helpful for moving to more advanced frameworks like JSF.
regards,
Brenden

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 public void actionPerformed(ActionEvent e) {
 actionExit();
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 menuBar.add(fileMenu);
 setJMenuBar(menuBar);
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 addTextField = new JTextField(30);
 addPanel.add(addTextField);
 JButton addButton = new JButton("Add Download");
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 /* If not in the middle of clearing a download,
 set the selected download and register to
 receive notifications from it. */
 if (!clearing) {
 selectedDownload =
 tableModel.getDownload(table.getSelectedRow());
 selectedDownload.addObserver(DownloadManager.this);
 updateButtons();
 // Pause the selected download.
 private void actionPause() {
 selectedDownload.pause();
 updateButtons();
 // Resume the selected download.
 private void actionResume() {
 selectedDownload.resume();
 updateButtons();
 // Cancel the selected download.
 private void actionCancel() {
 selectedDownload.cancel();
 updateButtons();
 // Clear the selected download.
 private void actionClear() {
 clearing = true;
 tableModel.clearDownload(table.getSelectedRow());
 clearing = false;
 selectedDownload = null;
 updateButtons();
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 currently selected download's status. */
 private void updateButtons() {
 if (selectedDownload != null) {
 int status = selectedDownload.getStatus();
 switch (status) {
 case Download.DOWNLOADING:
 pauseButton.setEnabled(true);
 resumeButton.setEnabled(false);
 cancelButton.setEnabled(true);
 clearButton.setEnabled(false);
 break;
 case Download.PAUSED:
 pauseButton.setEnabled(false);
 resumeButton.setEnabled(true);
 cancelButton.setEnabled(true);
 clearButton.setEnabled(false);
 break;
 case Download.ERROR:
 pauseButton.setEnabled(false);
 resumeButton.setEnabled(true);
 cancelButton.setEnabled(false);
 clearButton.setEnabled(true);
 break;
 default: // COMPLETE or CANCELLED
 pauseButton.setEnabled(false);
 resumeButton.setEnabled(false);
 cancelButton.setEnabled(false);
 clearButton.setEnabled(true);
 } else {
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 pauseButton.setEnabled(false);
 resumeButton.setEnabled(false);
 cancelButton.setEnabled(false);
 clearButton.setEnabled(false);
/* Update is called when a Download notifies its
 observers of any changes. */
 public void update(Observable o, Object arg) {
 // Update buttons if the selected download has changed.
 if (selectedDownload != null && selectedDownload.equals(o))
 updateButtons();
 // Run the Download Manager.
 public static void main(String[] args) {
 DownloadManager manager = new DownloadManager();
 manager.show();
This example shows how to create a simple download manager in Java. It contains four classes in foru Java source files:
Download.java: Contains Download class which downloads a file from a URL.
DownloadManager.java: Contains the main class for download manager application.
DownloadsTableModel.java: Contains the class which manages the download table's data.
ProgressRenderer.java: Contains the class which is responsible to render a JProgressBar in a table cell.
The contents of the listed files are written below.
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import java.io.*;
import java.net.*;
import java.util.*;
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class Download extends Observable implements Runnable {
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 public static final String STATUSES[] = {"Downloading",
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 public static final int PAUSED = 1;
 public static final int COMPLETE = 2;
 public static final int CANCELLED = 3;
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 private int downloaded; // number of bytes downloaded
 private int status; // current status of download
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 downloaded = 0;
 status = DOWNLOADING;
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 download();
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 return url.toString();
 // Get this download's size.
 public int getSize() {
 return size;
 // Get this download's progress.
 public float getProgress() {
 return ((float) downloaded / size) * 100;
 // Get this download's status.
 public int getStatus() {
 return status;
 // Pause this download.
 public void pause() {
 status = PAUSED;
 stateChanged();
 // Resume this download.
 public void resume() {
 status = DOWNLOADING;
 stateChanged();
 download();
 // Cancel this download.
 public void cancel() {
 status = CANCELLED;
 stateChanged();
 // Mark this download as having an error.
 private void error() {
 status = ERROR;
 stateChanged();
 // Start or resume downloading.
 private void download() {
 Thread thread = new Thread(this);
 thread.start();
 // Get file name portion of URL.
 private String getFileName(URL url) {
 String fileName = url.getFile();
 return fileName.substring(fileName.lastIndexOf('/') + 1);
 // Download file.
 public void run() {
 RandomAccessFile file = null;
 InputStream stream = null;
 try {
 // Open connection to URL.
 HttpURLConnection connection =
 (HttpURLConnection) url.openConnection();
 // Specify what portion of file to download.
 connection.setRequestProperty("Range",
 "bytes=" + downloaded + "-");
 // Connect to server.
 connection.connect();
 // Make sure response code is in the 200 range.
 if (connection.getResponseCode() / 100 != 2) {
 error();
 // Check for valid content length.
 int contentLength = connection.getContentLength();
 if (contentLength < 1) {
 error();
 /* Set the size for this download if it
 hasn't been already set. */
 if (size == -1) {
 size = contentLength;
 stateChanged();
 // Open file and seek to the end of it.
 file = new RandomAccessFile(getFileName(url), "rw");
 file.seek(downloaded);
 stream = connection.getInputStream();
 while (status == DOWNLOADING) {
 /* Size buffer according to how much of the
 file is left to download. */
 byte buffer[];
 if (size - downloaded > MAX_BUFFER_SIZE) {
 buffer = new byte[MAX_BUFFER_SIZE];
 } else {
 buffer = new byte[size - downloaded];
 // Read from server into buffer.
 int read = stream.read(buffer);
 if (read == -1)
 break;
 // Write buffer to file.
 file.write(buffer, 0, read);
 downloaded += read;
 stateChanged();
 /* Change status to complete if this point was
 reached because downloading has finished. */
 if (status == DOWNLOADING) {
 status = COMPLETE;
 stateChanged();
 } catch (Exception e) {
 error();
 } finally {
 // Close file.
 if (file != null) {
 try {
 file.close();
 } catch (Exception e) {}
 // Close connection to server.
 if (stream != null) {
 try {
 stream.close();
 } catch (Exception e) {}
 // Notify observers that this download's status has changed.
 private void stateChanged() {
 setChanged();
 notifyObservers();
/*__DownloadTableModel.java__*/
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
// This class manages the download table's data.
class DownloadsTableModel extends AbstractTableModel
 implements Observer {
 // These are the names for the table's columns.
 private static final String[] columnNames = {"URL", "Size",
 "Progress", "Status"};
 // These are the classes for each column's values.
 private static final Class[] columnClasses = {String.class,
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 // The table's list of downloads.
 private ArrayList downloadList = new ArrayList();
 // Add a new download to the table.
 public void addDownload(Download download) {
 // Register to be notified when the download changes.
 download.addObserver(this);
 downloadList.add(download);
 // Fire table row insertion notification to table.
 fireTableRowsInserted(getRowCount() - 1, getRowCount() - 1);
 // Get a download for the specified row.
 public Download getDownload(int row) {
 return (Download) downloadList.get(row);
 // Remove a download from the list.
 public void clearDownload(int row) {
 downloadList.remove(row);
 // Fire table row deletion notification to table.
 fireTableRowsDeleted(row, row);
 // Get table's column count.
 public int getColumnCount() {
 return columnNames.length;
 // Get a column's name.
 public String getColumnName(int col) {
 return columnNames[col];
 // Get a column's class.
 public Class getColumnClass(int col) {
 return columnClasses[col];
 // Get table's row count.
 public int getRowCount() {
 return downloadList.size();
 // Get value for a specific row and column combination.
 public Object getValueAt(int row, int col) {
 Download download = (Download) downloadList.get(row);
 switch (col) {
 case 0: // URL
 return download.getUrl();
 case 1: // Size
 int size = download.getSize();
 return (size == -1) ? "" : Integer.toString(size);
 case 2: // Progress
 return new Float(download.getProgress());
 case 3: // Status
 return Download.STATUSES[download.getStatus()];
 return "";
/* Update is called when a Download notifies its
 observers of any changes */
 public void update(Observable o, Object arg) {
 int index = downloadList.indexOf(o);
 // Fire table row update notification to table.
 fireTableRowsUpdated(index, index);
/*__ProgressRenderer.java__*/
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
// This class renders a JProgressBar in a table cell.
class ProgressRenderer extends JProgressBar
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 super(min, max);
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 public Component getTableCellRendererComponent(
 JTable table, Object value, boolean isSelected,
 boolean hasFocus, int row, int column) {
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Thank you for the quick reply! But the solution provided by you, it seems, has still not been able to address my issue. I ran the program at command prompt with your said parameters, but the download still gave an error in the App window.
Also, is there some way of defining these parameters in the source code? I am keen in using NetBeans to run the program.
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</A>A note about DNS
Hostname aliases must be configured in DNS. This is done with a CNAME record. For example:
A 128.101.101.101
CNAME

Additional MX records are not required to use hostname aliases.

If you aren't sure about how to configure your DNS records, consult the book DNS and Bind by Paul Albitz and
Cricket Liu.

You can find the connection settings in Tools > Options > Advanced : Network : Connection
See "Firefox connection settings":
*[[Firefox cannot load websites but other programs can]]

My printer will not print the web pages using firefox...how do I set it up to print a web page?

I have an hp photosmart c4180 printer and it will not print the web pages in firefox...how exactly do I set up FF so I can print web pages? I will need step by step instruction also on exactly where to go to set it up.

Open System Preferences (gear icon on the dock), then open Print & Scan
Click the + button at the bottom of the printer list
If your printer appears....not all printers are supported....click on the name to highlight it
Click the Add button to install the printer at the AirPort Express location
Try to print. You must choose the correct printer at the AirPort Express location since the printer is "installed" at other locations on your network.
If you open Print & Scan again, and select the printer at the AirPort Express, there is an option to make the printer the "default" location, so you do not have to choose which location to select when you want to print.

How do I set a breakpoint in a Java Server page (.jsp)?

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