java.security.AccessControlException

[Nancy.Nicole]

I need to create an instance of a class that writes a file. I am
getting this exception:

basic: Stopping applet ...
basic: Removed progress listener:
sun.plugin.util.GrayBoxPainter@1157f77
basic: Finding information ...
basic: Releasing classloader: sun.plugin.ClassLoaderInfo@170888e,
refcount=0
basic: Caching classloader: sun.plugin.ClassLoaderInfo@170888e
basic: Current classloader cache size: 1
basic: Done ...
basic: Joining applet thread ...
basic: Destroying applet ...
basic: Disposing applet ...
basic: Quiting applet ...
basic: Joined applet thread ...
basic: Unregistered modality listener
basic: Registered modality listener
basic: Referencing classloader: sun.plugin.ClassLoaderInfo@170888e,
refcount=1
basic: Added progress listener: sun.plugin.util.GrayBoxPainter@a6faa9
basic: Loading applet ...
basic: Initializing applet ...
basic: Starting applet ...
java.security.AccessControlException: access denied
(java.io.FilePermission data.dat 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.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileReader.<init>(Unknown Source)
at DataAccess.load(DataAccess.java:11)
at AddressBook32.<init>(AddressBook32.java:35)
at Z115.init(Z115.java:107)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
basic: Exception: java.security.AccessControlException: access denied
(java.io.FilePermission data.dat read)
java.security.AccessControlException: access denied
(java.io.FilePermission data.dat 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.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileReader.<init>(Unknown Source)
at DataAccess.load(DataAccess.java:11)
at AddressBook32.<init>(AddressBook32.java:35)
at Z115.init(Z115.java:107)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
basic: Modality pushed
basic: Modality popped
Exception in thread "thread applet-Z115.class"
java.lang.NullPointerException
at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
at sun.plugin.AppletViewer.showAppletException(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)


I need to combat this exception. How do I do this?

Thanks.

 

[Matt Humphrey]

I need to create an instance of a class that writes a file. I am
getting this exception:

basic: Stopping applet ...
basic: Removed progress listener:
sun.plugin.util.GrayBoxPainter@1157f77
basic: Finding information ...

basic: Starting applet ...
java.security.AccessControlException: access denied
(java.io.FilePermission data.dat read)
at java.security.AccessControlContext.checkPermission(Unknown Source)

<snip exception remainder>

Applets (for very good reason) do not generally have permission to read or
write files on the user's machine. Typically you must sign the applet,
request the permission and the user must grant it or you must otherwise
persuade the user to modify the JVM security policy to allow file access.
For details on signing, try http://mindprod.com/jgloss/signedapplets.html

Matt Humphrey (e-mail address removed) http://www.iviz.com/