Re: [Aglets-users] Fwd: Urgent need help! Problem with file access permissions-Aglets

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Hey Thomas,

Thanks for your reply. I found out that the codebase is the 'atp' one, I
granted the propertypermission in that codebase and its still giving the
same exception.

Regards
Shruti

On Sun, Apr 1, 2012 at 4:53 AM, Thomas Herlea <
max...@us...> wrote:

> Could it be that the code is not in any of those three codebases? I
> know two ways to find out.
>
> First: comment out the file access call that is causing the exception,
> so you have an agent that can run. Launch it in Tahiti the same way as
> before, except this time there will be no exception. Select the aglet
> in the main window and press the Info' button. Use the value of the
> codeBase field to detemine which section, if any, the aglet belongs
> to. I'd be curious to know that value, too.
>
> Second method: Make three tries to see which of the three sections
> applies to this aglet: make one section at a time grant only
> permission 'java.security.AllPermission "*", "*";' and keep the other
> two as until now. If the aglet works only one time of the three, you
> know which section the codeBase belongs to and then you need to make
> sure the PropertyPermission grant is written correctly.
>
> You could always download aglets-2.5-gamma, load an aglet through a
> file:// URL and be sure that it is the "file" section where the
> permission needs to go.
>
> Hope this helps,
>
> Thomas
>
>
> On Sat, Mar 31, 2012 at 21:27, shruti nagani <shr...@gm...>
> wrote:
> > Hi,
> >
> > I just added the permissions to all the sections, still getting the same
> > result. I have attached a jpeg which shows the stacktrace.
> >
> > Regards
> > Shruti
> >
> >
> > On Sun, Apr 1, 2012 at 12:55 AM, shruti nagani <shr...@gm...>
> > wrote:
> >>
> >> Hi Thomas,
> >>
> >> Thank you for the prompt reply. I think I understood what you're trying
> to
> >> say, I still have one doubt, there are 3 codebase sections in the
> >> aglets.policy file (atp, http, file), to which should I give
> >> the necessary permissions.
> >>
> >>
> >> Thanks again!
> >>
> >> Regards
> >> Shruti
> >>
> >>
> >> On Sun, Apr 1, 2012 at 12:27 AM, Thomas Herlea
> >> <max...@us...> wrote:
> >>>
> >>> (Forgot to send this to the list)
> >>>
> >>>
> >>> ---------- Forwarded message ----------
> >>> From: Thomas Herlea <max...@us...>
> >>> Date: Sat, Mar 31, 2012 at 19:23
> >>> Subject: Re: Urgent need help! Problem with file access
> >>> permissions-Aglets
> >>> To: shruti nagani <shr...@gm...>
> >>>
> >>>
> >>> Dear Shruti,
> >>>
> >>> The security exception you got does not mean the aglet is prevented
> >>> from accessing the file, but that it is prevented from finding out
> >>> what the current directory is. That is what the 'user.dir' property
> >>> stores. See
> >>>
> http://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
> >>> for a list of system properties. Perhaps you are using a relative path
> >>> to your file in your code and therefore at some point the method for
> >>> accessing the file has to first look up the current directory, at
> >>> which point it throws the exception.
> >>>
> >>> You can use the AccessControlException messages to guide you in adding
> >>> the required permission to the 'aglets.policy' file. It mentions the
> >>> missing permission type, 'java.util.PropertyPermission', so you should
> >>> look it up to see how it is granted
> >>>
> >>> (
> http://docs.oracle.com/javase/7/docs/technotes/guides/security/permissions.html#PropertyPermission
> ).
> >>>  You will discover the parameters available when granting it. These
> >>> parameters are specific to the permission type, so you really need to
> >>> look in yhe documentation. For PropertyPermission you specify a
> >>> pattern to match one or more properties, in your case 'user.dir' or
> >>> something with wildcards which covers 'user.dir', too. Then you
> >>> provide in the grant of a PropertyPermission an action about the
> >>> property or properties matching the first parameter. In your case
> >>> 'read' is needed, but you also can grant a 'write' permission or both,
> >>> using the list syntax specified in the documentation.
> >>>
> >>> I think it is an interesting problem to determine during development
> >>> which permissions an aglet may need. Does anyone know a more automated
> >>> method than looking up in the API documentation which
> >>> AccessControlExceptions every method call might throw? The guide
> >>> linked to above does have a section "Methods and the Permissions They
> >>> Require", but if the method listed there is called internally by
> >>> another standard library method which you call, I don't know if it is
> >>> easy to determine what exceptions may be thrown indirectly like that.
> >>>
> >>> Good luck!
> >>>
> >>> Thomas
> >>>
> >>>
> >>>
> >>> On Sat, Mar 31, 2012 at 16:28, shruti nagani <shr...@gm...>
> >>> wrote:
> >>> >
> >>> > Hi,
> >>> >
> >>> > I am accessing a file on my system from an aglet whose code is also
> on
> >>> > my system
> >>> > I am getting the following exception:
> >>> >
> >>> > java.security.AccessControlException:access denied
> >>> > ("java.util.PropertyPermission" "user.dir" "read")
> >>> >
> >>> > at java.security...etc etc
> >>> >
> >>> >
> >>> > I edited the aglets.policy in $HOME/.aglets/security and appended the
> >>> > following line
> >>> >
> >>> > permission java.io.FilePermission
> >>> >  "C:\\Users\\new\\Documents\\arffs\\bayes_labeled.arff", "read";
> >>> >
> >>> > to all 3 sections, (atp, http and file)
> >>> >
> >>> > bayes_labeled.arff is the file I need to read
> >>> >
> >>> > I am still getting the same exception. Please someone tell what am I
> >>> > doing wrong here?
> >>> >
> >>> > I'll be very grateful! Have been stuck on this for the past week.
> >>> >
> >>> > Thanks a tonne in advance!!
> >>> >
> >>> > Shruti
> >>>
> >>>
> >>>
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> >>
> >>
> >>
> >>
> >
> >
> >
>