Applet Issue

[ace84]

I created an applet that i want to post on my site. I wrote it and compiled it and it works fine on my computer. But when I upload it to my server, I keep getting this error and I am not sure what I need to do to fix it. Can anyone help me?!?!



Java Plug-in 1.6.0_10-ea
Using JRE version 1.6.0_10-ea Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\Me

java.security.AccessControlException: access denied (java.util.PropertyPermission user.dir read)
at java.security.AccessControlContext.checkPermission (Unknown Source)
at java.security.AccessController.checkPermission(Unk nown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPropertyAccess(Unkn own Source)
at java.lang.System.getProperty(Unknown Source)
at java.io.Win32FileSystem.getUserPath(Unknown Source)
at java.io.Win32FileSystem.resolve(Unknown Source)
at java.io.File.getAbsolutePath(Unknown Source)
at javax.swing.filechooser.WindowsFileSystemView.isFl oppyDrive(Unknown Source)
at javax.swing.plaf.basic.BasicFileChooserUI$BasicFil eView.getIcon(Unknown Source)
at javax.swing.JFileChooser.getIcon(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI$Director yComboBoxRenderer.getListCellRendererComponent(Unk nown Source)
at javax.swing.plaf.basic.BasicListUI.updateLayoutSta te(Unknown Source)
at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayo utState(Unknown Source)
at javax.swing.plaf.basic.BasicListUI$Handler.valueCh anged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueCha nged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueCha nged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueCha nged(Unknown Source)
at javax.swing.DefaultListSelectionModel.changeSelect ion(Unknown Source)
at javax.swing.DefaultListSelectionModel.changeSelect ion(Unknown Source)
at javax.swing.DefaultListSelectionModel.setSelection Interval(Unknown Source)
at javax.swing.JList.setSelectedIndex(Unknown Source)
at javax.swing.plaf.basic.BasicComboPopup.setListSele ction(Unknown Source)
at javax.swing.plaf.basic.BasicComboPopup.access$300( Unknown Source)
at javax.swing.plaf.basic.BasicComboPopup$Handler.ite mStateChanged(Unknown Source)
at javax.swing.JComboBox.fireItemStateChanged(Unknown Source)
at javax.swing.JComboBox.selectedItemChanged(Unknown Source)
at javax.swing.JComboBox.contentsChanged(Unknown Source)
at javax.swing.AbstractListModel.fireContentsChanged( Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI$Director yComboBoxModel.setSelectedItem(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI$Director yComboBoxModel.addItem(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI$Director yComboBoxModel.access$900(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI.doDirect oryChanged(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI.access$1 200(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI$5.proper tyChange(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChang e(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChang e(Unknown Source)
at java.awt.Component.firePropertyChange(Unknown Source)
at javax.swing.JFileChooser.setCurrentDirectory(Unkno wn Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at fUpload.<init>(fUpload.java:25)
at sun.reflect.NativeConstructorAccessorImpl.newInsta nce0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInsta nce(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newI nstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

[chaarmann]

An applet runs on the client, not on the server. It runs inside a Sandbox of the browser (in opposition to an "application"), so it should NEVER have the rights to access local directories on the client!
So it is fully normal that you get an "security exception" when you try to access a directory. It would be very bad if you can actually do it. You said, it runs on your PC, then your PC is open for all Hackers; everybody can send you an hidden applet in a webpage now and read all your passwords and online-banking details etc. that are stored on your PC. So I would advise you to put back the original security settings of your browser as fast as possible! And don't lower the security of your server, only to "get the program running". Think of alternative methods to handle files (upload etc.) or read additional data (Ajax).

[BigDaddyLH]

I agree with everything chaarmann said. If you want some help, you need to tell us about your program. So far, you have only shown what goes wrong. We have no idea what your program is meant to do, what your goal is.

My rule of thumb is to never write applets. Not everyone is so anti-applet, but to me the time of the applet has come and gone, if it was ever here. If you really want to write a Swing GUI, I would suggest writing a normal desktop application. But as I just wrote, I don't know what you are trying to do.