Native Methods and Applets

Question

Hi, I need to use data glove woth vrml.
To do so i use a java class that invoke native methods, because the glove's sdk are only for VC++, but i receive the security exception. I know that applets con't load native methods and i think that java classes loaded from vrml are considered like applets.
Anyone can tell me if is possible to change security policy, for example giving all permissions to applet, i'm not interested in security, the code work in local. Thanks to all this is for my thesis in VR.

Answer 1

Right. I understand. Here's what I've been able to find out:
1) As I thought, your script node Java class is being run by the Microsoft JVM. (Hence the com.ms.. exception.)
2) In order for the VM to run classes that use native code, you'll have to make your code trusted by:
- i) Asserting the permission required to run native code in your Java source, through a PolicyEngine.assertPermission method call. See http://support.microsoft.com/kb/q175622/
- ii) Package up the class in a Microsoft CAB file and sign the cab file. See http://support.microsoft.com/default.aspx?scid=kb;en-us;Q193877
Look at http://www.jguru.com/faq/view.jsp?EID=468498 first for an overview of both of these.
3) It seems that Cortona (as a non-standard extension) can use script classes in cab files (whether signed or not), so you might be in luck here. See http://forums.parallelgraphics.com/show/forum/general/messages/59/
You might need to get hold of the (now unsupported) Microsoft SDK for Java 4.0 in order to create and sign your CAB file. I found this at ftp://ftp.crystalpoint.com/updates/ovweb/sdkjava40.exe but I cannot vouch for this executable. Use at your own risk.
For the benefit of other readers, it seems that Cortona cannot be used with the Sun JRE, so the OP is out of luck there.
Let us know how you get on.
Alex