Java applet security problem! Please help?

Question

I am writing a Java image uploader applet for a client in which the user uses the JFileChooser to select an image from their machine to be uploaded to a database.

I keep getting a java security exception. I understand why, because no one should be able to simply read files from a person's computer. That could be malicious. However, I know it is possible because several sites use java applets to upload images.

From what I understand, I need to sign the applet, but I am unsure of that process. Can anyone tell me if there is a simple solution to this? I don't have much time to spare.

I will award the most informative answer with 10 points and my sincere gratitude :D

Thanks!

Answer 1

I think that someone is pulling a joke on you. That display appears to be just an image file and there is no applet associated.... +add Oh, of course. That's why it's just an image. I thought that you were giving me the link that is supposed to load the applet. You'd need to do that in order to get more help. However, I recommend right clicking and choosing 'view page source' to get more info about the applet.

Answer 2

You need to setup a handler for that java security exception.

Sort of like when you read from a text file, you need an io exception handler, to catch the problem if it cannot find the text file..

Answer 3

You can't get out of the sandbox by catching exceptions.



Go here: http://www.raditha.com/java/sandbox/

The author of that blog did a great writeup on how to either sign your applet or go a different route.

Answer 4

You need to catch the exception.



try{



//your jFileChooser code



}catch(YourException e){



//message of when the exception happens



}