I have to make an audio player in java applet so that it can be used on websites. It will browse files on the computer, make its playlist and will play them one by one.
I have compiled the .jar file and done everything correctly in the <applet> tag in html. Now when I try to run it on netbeans (applet emulator) it runes perfectly! However, when I try to run it on HTML page with applet tags, it does not run. it shows the following error:

java.lang.reflect.InvocationTargetException
	at java.awt.EventQueue.invokeAndWait(Unknown Source)
	at main.init(main.java:32)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied (java.io.FilePermission C:\Users\Dee Jay'\Documents read)
	at java.security.AccessControlContext.checkPermission(Unknown Source)
	at java.security.AccessController.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkRead(Unknown Source)
	at java.io.File.exists(Unknown Source)
	at java.io.Win32FileSystem.canonicalize(Unknown Source)
	at java.io.File.getCanonicalPath(Unknown Source)
	at sun.awt.shell.Win32ShellFolderManager2.createShellFolder(Unknown Source)
	at sun.awt.shell.Win32ShellFolderManager2.getPersonal(Unknown Source)
	at sun.awt.shell.Win32ShellFolderManager2.get(Unknown Source)
	at sun.awt.shell.ShellFolder.get(Unknown Source)
	at javax.swing.filechooser.FileSystemView.getDefaultDirectory(Unknown Source)
	at javax.swing.JFileChooser.setCurrentDirectory(Unknown Source)
	at javax.swing.JFileChooser.<init>(Unknown Source)
	at javax.swing.JFileChooser.<init>(Unknown Source)
	at main.initComponents(main.java:62)
	at main.access$000(main.java:23)
	at main$1.run(main.java:34)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
java.lang.NullPointerException
	at main.init(main.java:41)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NullPointerException

Someone told me that I have to do something to read files from the harddisk. I do not understand that.
Please tell me how to solve it ...

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