applet errors please help

**newbie_jar** · 11-09-2011, 08:06 PM

ok, i will explain...
the applet loads and it checks to see if the folder c:\windows\fonts exists, then it download the font into the font folder, then it loads the new url address inside user account. of course there are more then one files downloaded and installed in different places
i need to have my font installed so the page look very nice to users, then it installs a new file in program files for a particular game...
then the browser is redirected to a thank you page where user is informed hes game was updated and everything is fine.
this application application is for users to install what they need for this game. it's very hard for many peoples to follow a tutorial and copy paste by hand files, so this helps a lot. many of them by accidentally erase important files, give wrong extensions to files etc.
let me know if i did something wrong?

**Norm** · 11-09-2011, 08:12 PM

Why are you getting a NullPointerException/ What variable is null? Why is the value of the variable null?

What is involved in downloading a file. What are the steps the applet takes.

loads the new url address inside user account.

What does "load" mean?

**Norm** · 11-09-2011, 08:13 PM

Have you looked at using JNLP if you need to read and write files on a user's PC?

**newbie_jar** · 11-09-2011, 08:28 PM

"loads" new url, means the browser is redirected to a thank you page and from there he can go to account page
as you can see the script first check for a temp folder, which usually doesn't exist, then it checks for the font directory in windows, then it write the font, then it goes to the redirect step and finis.
the write and redirect code is not posted on this forum, i only posted the checking directory part. if necessary i can send it to you directly.
i don't know what is JNLP

**Norm** · 11-09-2011, 08:31 PM

And what about the NPE? Have you tracked that down.

Go to this site and read up on what JNLP can do:
The Really Big Index

**newbie_jar** · 11-09-2011, 10:08 PM

nope i didn't track the NPE...
"Ignored exception: java.lang.NullPointerException"
what exactly means this?

**Norm** · 11-09-2011, 10:09 PM

I've never seen that format/text of the message. Does your program print it?

**newbie_jar** · 11-10-2011, 02:00 AM

well, the code is good, the only problem is related to access restriction...
so, i'm asking about a manifest file... what is that what's doing? can manifest file help me in this case?
according to microsoft, the manifest file helps to avoid the access restriction

Step 6: Create and Embed an Application Manifest (UAC)

here you can find a scheme for the UAC...

Can the manifest file from java support such a request?

**Norm** · 11-10-2011, 02:03 AM

Do you have a link to where you got that info. I can't believe that MS would be talking about the java jar file manifest file.

**newbie_jar** · 11-10-2011, 02:15 AM

here's the link again:
Step 6: Create and Embed an Application Manifest (UAC)
ms is talking about an exe file... to add manifest so the user is warned about the application which needs UCC...

**Norm** · 11-10-2011, 12:22 PM

Your code is not an exe file. Its interpreted by the java.exe program.

**newbie_jar** · 11-10-2011, 06:34 PM

yes, i know it's not an exe, but as i know jar files contains a manifest, isn't this manifest inside jar file causing me the problem?

**Norm** · 11-10-2011, 06:45 PM

I'm sure that the word manifest is used in many different places and that it has many different shapes and purposes.
I don't know if the manifest file is the problem. If you can give yourself permission to access a user's PC then there is no security protection for the user.

**newbie_jar** · 11-11-2011, 08:01 PM

i have 2 new questions:
1. If i sign the jar file with a CA certificate will solve my problem?!
2. At this point, without this permission i would like to redirect the users to a page that says the applet was did not succeed to make the changes, and it must be installed manually. Is this possible?
thank you!