Re: File.createTempFile not works in applets

From:

"Andrew Thompson" <andrewthommo@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

12 Sep 2006 15:56:12 -0700

Message-ID:

<1158101772.316137.255020@p79g2000cwp.googlegroups.com>

Zaka Ferenc wrote:
....

I've read forum posts asking "my temporary files is not deleted after terminating the applet, how can i solve..." and much very similar questions.
I dont' understand them because I don't know how they can create temporary files from applets. Viz. my tries to create tempfiles has always ended in the same failure:
java.lang.SecurityException: Unable to create temporary file

An applet needs to be digitally signed, and accepted as
trusted by the end user, before it can do anything with files
(or many other things).

If an applet is running in the untrusted security 'sandbox',
and attempts any action that requires trust, it will throw
SecurityExceptions.

I've looked at the java settings in control panel, but I haven't found any related setting.
And even if I would find the "enable" checkbox I can't ask every vistor to go and find and change this setting manually.

You can ask them to accept digitally signed code.

Whether they *grant* full access for the applet to mess
with their PC is another matter (it is either 'trust or no trust'
for 'none or all security' - there are no finer levels).

(..and please insert 'line breaks' after about 60-70 chars
when posting messages to usenet)

HTH

Andrew T.