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Java Web Start Permissions

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Does anyone here know about permissions in Java Web Start?

I'm starting to learn how to use Java Web Start. After a bumpy start, I 
finally succeeded in getting some Hello World applets and applications to 
work perfectly via Java Web Start.

Now I'm working on a considerably more sophisticated application and 
bumping into issues involving permissions. For example, the first error I 
am getting is: 

access denied ("java.util.PropertyPermission" "user.name" "read")

I'm also expecting to need permission to write logs, although I haven't 
gotten that far into executing my code yet. It's possible that there will 
be other things that need permission too.

Can anyone explain how I give the application the permissions it needs? 
I've done some googling on this issue and know that policy files are part 
(or all?) of the solution. I see that I that there is a master permissions 
file as well as individual permission files for individual users, situated 
in their home directories. Is the user's home directory always My Documents 
in Windows? (I'm only worried about serving Windows users for the moment 
but I have no idea which version of Windows they'll have: XP, Vista, 7 or 
whatever.)

I'm assuming the JNLP file for the Java Web Start also needs to have 
something in it to point to the necessary permission. Unfortunately, the 
documentation I've found so far is NOT very clear and examples are scarce 
so I'm not sure what needs to happen in the JNLP file.

I'm also interested in knowing how the user of the application gives his 
consent to any permissions I need. For instance, if I create a policy file 
that gives me permission to do what I need to do, how does the user of the 
Java Web Start application keep me from doing bad things, like deleting 
every file on his hard drive? It seems to me that I should only be able to 
request what I need but that the user of the program needs to be able to 
look over that request, realize how dangerous or harmless that request is, 
and then give consent if he is satisfied that it is safe. But how/when does 
that happen? Do I send him the policy file and then let him eyeball it in a 
text editor to make sure it's not doing something inappropriate? Then wait 
for him to put the policy file in the appropriate place?



-- 
Novice

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Thread

Java Web Start Permissions Novice <novice@example..com> - 2012-01-23 01:48 +0000
  Re: Java Web Start Permissions Knute Johnson <nospam@knutejohnson.com> - 2012-01-22 19:02 -0800
    Re: Java Web Start Permissions Novice <novice@example..com> - 2012-01-23 19:04 +0000
      Re: Java Web Start Permissions Knute Johnson <nospam@knutejohnson.com> - 2012-01-23 13:41 -0800
        Re: Java Web Start Permissions "John B. Matthews" <nospam@nospam.invalid> - 2012-01-23 21:32 -0500
          Re: Java Web Start Permissions Knute Johnson <nospam@knutejohnson.com> - 2012-01-23 21:22 -0800
            Re: Java Web Start Permissions "John B. Matthews" <nospam@nospam.invalid> - 2012-01-24 01:40 -0500
              Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 09:21 -0500
            Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 04:23 -0500
              Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 04:40 -0500
            Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 05:20 -0500
            Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 06:08 -0500
            Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 07:22 -0500
  Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 05:42 -0500
  Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 07:43 -0500
    Re: Java Web Start Permissions Gunter Herrmann <notformail0106@earthlink.net> - 2012-01-24 16:48 -0500
      Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-24 18:13 -0500
        Re: Java Web Start Permissions Gunter Herrmann <notformail0106@earthlink.net> - 2012-01-25 10:28 -0500
          Re: Java Web Start Permissions Jeff Higgins <jeff@invalid.invalid> - 2012-01-25 12:06 -0500
  Re: Java Web Start Permissions Roedy Green <see_website@mindprod.com.invalid> - 2012-01-24 09:48 -0800

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