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Runtime extension instalation  RSS feed

Intars Pogis
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Im currently working video conferencing project.
Everything is fine with video sending/receiving.

Client need jre instaled and jmf( Java Meda Framework ) extension.

There are few ways to instal jmf, one of them is describet there :

It works fine, but client have to :
#2 confirm that they trust me( signed applet)

#1 in yes/no dialog press yes to instal extension:
-Implementation-URL ...

What I want to do is to awoid yes/no dialog for plugin instalation.
If client "trust" me, it gives me permission to search client machine for jmf.jar and instal(copy byte by byte) jmf.jar to client machine.

Problem is accessing instaled classess because ClassLoader havent load them.
I tried somthing like this :

JarFile jf;
Enumeration e;

URL[] urlList = {new File("path to jmf.jar").toURL()};
ClassLoader loader = new URLClassLoader(urlList);
JarFile jf = new JarFile("path to jmf.jar");

for (Enumeration e = jf.entries() ; e.hasMoreElements() {
String jarEntry = e.nextElement().toString();

if (jarEntry.endsWith(".class")) {

jarEntry = jarEntry.replace('/','.');
jarEntry = jarEntry.substring(0,jarEntry.length()-6);
Class inst = loader.loadClass(jarEntry);

This works fine, but when I try :
Object o = inst.newInstance();

I get :

DirectSound Capture Supported = true
Exception on commit = java.lang.SecurityException: commit: Permission denied
DirectSoundAuto: Committed ok
java.lang.InstantiationException: Export

As far as I know java.policy.applet, created by Eclipse gives maximum permissions.

Well anyway is there way to instal extensions like jmf.jar runtime in applet? ( http://www.javaworld.com/javaworld/jw-10-1996/jw-10-indepth.html says its not possible in applets )


There is one more way to get done with it :
Include jmf.jar in archive="" but its 2mb and even if I cut it I guess it will be at least 1mb huge.

I can make an applet which checks if user have jmf instaled withot making trused applet, and then in videoconferencing applet include archive="jmf.jar", if its not.

Second problem is : How to access archive="jmf.jar", to be copied to client lib/ext directory, so next time user will not have to instal anything !??

If I could handle 1 of those 2 problem everything would be OK!

(sorry abut poor english)
Thank u!
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