if .java.policy file is present on the system then applet using ImageIO API to read the image fails to load by throwing Security exception as follows

java.security.AccessControlException: access denied (java.io.FilePermission C:\DOCUME~1\jitu\LOCALS~1\Temp\imageio45947.tmp delete)
	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.checkDelete(Unknown Source)
	at java.io.File.delete(Unknown Source)
	at javax.imageio.stream.FileCacheImageInputStream$StreamDisposerRecord.dispose(Unknown Source)
	at javax.imageio.stream.FileCacheImageInputStream.close(Unknown Source)
	at javax.imageio.ImageIO.read(Unknown Source)
	at javax.imageio.ImageIO.read(Unknown Source)
	at MainGetResourceApplet.loadTheResource(MainGetResourceApplet.java:85)
	at MainGetResourceApplet.access$000(MainGetResourceApplet.java:10)
	at MainGetResourceApplet$1.run(MainGetResourceApplet.java:58)
	at java.lang.Thread.run(Unknown Source)

Steps to reproduce:
------------------
Make sure that there is no .java.policy file exists on the system
1) Install 6u10 and load following applet inside the browser
http://sqeweb.sfbay.sun.com/deployment2/jitu/plugInTestsNoHarness/Liveconnect/html/MainGetResourceImageApplet.html

You can notice that applet loads fine
2)Close the browser(make sure that you dispose all the instances of browser)
3) Now create a .java.policy file inside <user_home> as follows
grant {
  permission java.io.FilePermission "<<ALL FILES>>", "read, write";
};
4)Load the same applet again inside the browser
http://sqeweb.sfbay.sun.com/deployment2/jitu/plugInTestsNoHarness/Liveconnect/html/MainGetResourceImageApplet.html

If applet fails to load with above mentioned exception getting thrown on the Java console then bug is reproduced
Posted Date : 2008-04-03 19:42:21.0

N/A

The problem there is caused by insufficient permissions to delete a temporary
 cache file.
 Suggested fix adds explicit check for read, write, and delete permissions for
 files in the cache directory (according to FilePermission spec, we should use
 path like /path/to/cachedir/* for this).

 If any of required permissions is not granted, ImageIO switches to memory-cached
 streams to avoid the problem described in this CR.
Posted Date : 2009-06-02 09:10:02.0