Regardless of what is the problem, I suggest you pack your files into a JAR file. And then sign it.

I never seen the "archive" attribute of the APPLET tag refer to .class files, only for .jar files - but that could be really possible, I don't know. All I know is that you'll surely want to make a JAR for your applet, for the source files and the resources your applet uses.

Take a look at Ant targets to automate the building process of your application, making it easier for you to build the jar, sign it, and deploy it, at a single button click ;)

Son Of Cain

Ant targets?

Never heard of ant? If you're using Netbeans or Eclipse, I'm sure you have dealed with it before, you just haven't noticed. Ant is a tool to automate the building process (and many, many other tasks) of your application.

Son Of Cain

You don't have to sign the JAR file unless you are trying to do something that an Applet normally can't do.

Yes, yes, thanks Capn'

Whenever I toy with applets, I'm always trying to reach out their security sandbox :p

I've tried a bunch of things in Eclipse to try to build a proper JAR file, one that will hold all my classes to be included in an HTML tag, but I've had no luck. I tried a lot of stuff that involved that "ant" symbol, but no luck yet... Can someone tell me step-by-step, how do I build a JAR file to hold my classes in so that I can run my multi-file program in a web-browser?

I do not use Eclipse, but I'm sure its standard building process already outputs a .jar file for you. Just copy and paste that to your web app dir and reference the .jar in the "archive" attribute

Son Of Cain

I searched the web for applet tag stuff, and everything I found only uses *.jar files in the archive tag. Yes, you can put more than one thing in the archive tag by using the ',' but they sould all be jar files.

Another thing I've noticed. I do a lot of applet code, and if I try to open the applet using the Eclipse 3.1 web browser that opens within the IDE, it never works. That is an Eclipse bug.

So jar your stuff up, and don't view from within eclipse.

Nope, Eclispe doesn't do that automatically. I followed your link, Glass Knife, and I found out how to Jar stuff using DOS commands. I did that, I jared up all of my .class files save my most important class (the one with run, init, that implements runable, etc..), and stuck in all my graphics and audio files in there too.

I put it into an HTML file like so:

WIDTH= 800 HEIGHT=600>


But when I run this using internet exlporer 5.0, the applet won't load properly, and I get this error in the status bar:

exception: java.security.AccessControlException: access denied (java.io.filePermission Graphics\Ship_Blue.gif read)

(Ship_Blue.gif is one of my graphics BTW, and yes, it loads fine when I run this program using eclipse)

I looked around on google to try to find an answer to this problem, but all I've found so far is information on protecting files . It tells me to go into my java home directory, find the file in lib\security called java.security, and type in something like:

    grant codeBase "http://h1.com/-" {        permission java.io.FilePermission "c:\\temp\\myfile", "read";    };

I Tried putting that at the bottom of the file, Except I put:

grant codeBase "C:\Documents and Settings\My Name\workspace\Test"{ permission java.io.FilePermission "C:\Documents and Settings\My Name\workspace\Test", "read";};

Yeah, I know, that is rather redundant that I put the same directory twice, but I didn't know what else to put as the codebase.

I'm still trying different things, but maybe someone here has run into this problem before, and can shed some light on it. None of my files are set to "read only", but even if they were, that wouldn't be a problem, seeing as I don't want to write to these files anyway.

Quote:

Original post by EGD Eric But when I run this using internet exlporer 5.0, the applet won't load properly, and I get this error in the status bar: exception: java.security.AccessControlException: access denied (java.io.filePermission Graphics\Ship_Blue.gif read)

Don't try to load files off the user's hard disc! Not only will the Applet not let you, they won't be there either.

Either use getResourceAsStream() (Which will load files from the jar) or something similar, or some file access method which loads stuff from the web server.

There are loads of examples.

Don't try to do local file IO, it won't work!

Mark

Yes, if you have stuff in a jar file, you must put all the images in the jar too.
// in the aplet code...
Toolkit toolkit = Toolkit.getDefaultToolkit();
ImageIcon icon = new ImageIcon( toolkit.getImage( getClass().getResource("/fileName.jpg")));

Note: I have had trouble loading a file from a jar file once because it needs a case-sensitive file name.

Hope that helps!