I created an applet that opens JFileChooser to select a file by clicking JButton . It works great when I run it in Eclipse. When I embed it on an HTML page with an applet tag, nothing happens when I click a button.
Any suggestions as to why JFileChooser doesn't open in the browser would be appreciated , but my main question is: how do I debug this? I could not find anything on Google on how to add the Java console in Firefox 3.6 or Chrome. Is there a way to get some information on why JFileChooser is not opening?
Debugging replied in the comment below
So, the console says that there is an exception that excludes access, which, I assume, is due to the fact that I did not "sign" the applet. What should be the development process before signing the applet? Do I have to sign it with a certificate issued by a valid CA before I can verify it in the browser, or is there some simple thing that you can do by simply checking?
Here is my code:
package com.putapplet; import java.awt.FlowLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.File; import java.io.InputStreamReader; import java.net.URL; import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JProgressBar; import javax.swing.SwingUtilities; @SuppressWarnings("serial") public class PutToS3Applet extends JApplet { private static long maxFileSizeInBytes = 1048576; private static String listenerUrl = "xxx"; private String listenerQueryString; private String signedPutUrl; private JProgressBar progressBar; private JButton button; private JLabel messageField; public void init() { setMaxFilesize(1); try { SwingUtilities.invokeAndWait(new Runnable() { public void run() { createGUI(); } }); } catch (Exception e) { System.err.println("createGUI didn't complete successfully"); } } private void createGUI() { button = new JButton("Choose File..."); button.addActionListener(new ButtonListener()); progressBar = new JProgressBar(0, 100); progressBar.setStringPainted(true); messageField = new JLabel();
Here is the exception:
Exception in thread "AWT-EventQueue-1" java.security.AccessControlException: access denied (java.util.PropertyPermission user.home read) at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374) at java.security.AccessController.checkPermission(AccessController.java:546) at java.lang.SecurityManager.checkPermission(SecurityManager.java:532) at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1285) at java.lang.System.getProperty(System.java:650) at javax.swing.filechooser.FileSystemView.getHomeDirectory(FileSystemView.java:393) at javax.swing.plaf.metal.MetalFileChooserUI.installComponents(MetalFileChooserUI.java:253) at javax.swing.plaf.basic.BasicFileChooserUI.installUI(BasicFileChooserUI.java:136) at javax.swing.plaf.metal.MetalFileChooserUI.installUI(MetalFileChooserUI.java:126) at javax.swing.JComponent.setUI(JComponent.java:662) at javax.swing.JFileChooser.updateUI(JFileChooser.java:1763) at javax.swing.JFileChooser.setup(JFileChooser.java:360) at javax.swing.JFileChooser.<init>(JFileChooser.java:333) at javax.swing.JFileChooser.<init>(JFileChooser.java:286) at com.putapplet.PutToS3Applet$ButtonListener.actionPerformed(PutToS3Applet.java:82) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.Component.processMouseEvent(Component.java:6289) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6054) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4652) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4482) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) at java.awt.Container.dispatchEventImpl(Container.java:2085) at java.awt.Component.dispatchEvent(Component.java:4482) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644) at java.awt.EventQueue.access$000(EventQueue.java:85) at java.awt.EventQueue$1.run(EventQueue.java:603) at java.awt.EventQueue$1.run(EventQueue.java:601) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) at java.awt.EventQueue$2.run(EventQueue.java:617) at java.awt.EventQueue$2.run(EventQueue.java:615) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:614) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Still don't know everything
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