URGENT: JVM versus Microsoft VM

Question

hi,
we have an application that works with applets. This application is installed locally to the users drive and runs from there. We use the java plugin for this (version 1.4.1).
Now we're facing the problem that some users already have the Microsoft plugin installed which they need to use for other applications. However, when they install our JVM the other apps no longer work. Furthermore our application doesn't work with the MVM, I think because of one of the following 2 reasons:
1) the security settings: easy to do with the JVM (change the java.policy) but how in earth do you do it for the MVM?
2) the fact (is this so?) that MVM uses something like JDK version 1.1
My question, apart from the two above, is: how can we solve this problem. How can we get our application to work with the MVM or how can you make the other apps work with the MVM and ours with the JVM (can they co-exist)?
Dollars for anyone who gives me something to work with!
tx very much,
Stijn

Answer 1

Hi
You can set the security settings for Internet(Zone 3) for MVM by
modifying the registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
For more information on security zones in IExplorer take a look at:
http://support.microsoft.com/default.aspx?scid=KB;EN-US;q182569&
The Java Permissions setting (1C00) has the following five possible values (binary):
Value Setting
00 00 00 00 Disable Java
00 00 01 00 High safety
00 00 02 00 Medium safety
00 00 03 00 Low safety
00 00 80 00 Custom
If Custom is selected, it uses {7839DA25-F5FE-11D0-883B-0080C726DCBB}
to store the custom information in a binary blob.
One possible way (for unsigned content or signed content) is to do this manually
(on your machine)from Tools->Internet Options ... and then
export the branch (using regedit to a .reg file for example).
Your installation process will merge the exported key with the registry
on the user's local machine.
On my machine (Win2000 Pro) the Zone\3 key .
with all the java permissions disabled and custom selected looks like this:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3]
"1C00"=hex:00,00,80,00
"{7839DA25-F5FE-11D0-883B-0080C726DCBB}"=hex:30,82,01,ca,03,02,00,00,30,82,01,\
c2,30,81,cc,06,0a,2b,06,01,04,01,82,37,0f,03,01,30,81,bd,06,09,2b,06,01,04,\
01,82,37,0f,01,31,81,af,30,81,ac,03,01,00,30,81,a6,a0,20,30,1e,06,09,2b,06,\
01,04,01,82,37,04,04,30,11,01,01,00,30,08,14,06,61,70,70,6c,65,74,30,00,30,\
00,a0,17,30,15,06,09,2b,06,01,04,01,82,37,04,07,30,08,03,02,00,01,03,02,00,\
02,a0,11,30,0f,06,09,2b,06,01,04,01,82,37,04,0c,03,02,00,02,a0,21,30,1f,06,\
09,2b,06,01,04,01,82,37,04,01,30,12,01,01,ff,01,01,00,01,01,00,01,01,00,01,\
01,00,01,01,00,a0,17,30,15,06,09,2b,06,01,04,01,82,37,04,02,30,08,01,01,00,\
01,01,ff,30,00,a0,1a,30,18,06,09,2b,06,01,04,01,82,37,04,03,30,0b,01,01,00,\
01,01,00,02,01,00,14,00,30,81,cc,06,0a,2b,06,01,04,01,82,37,0f,03,02,30,81,\
bd,06,09,2b,06,01,04,01,82,37,0f,01,31,81,af,30,81,ac,03,01,00,30,81,a6,a0,\
20,30,1e,06,09,2b,06,01,04,01,82,37,04,04,30,11,01,01,00,30,08,14,06,61,70,\
70,6c,65,74,30,00,30,00,a0,17,30,15,06,09,2b,06,01,04,01,82,37,04,07,30,08,\
03,02,00,01,03,02,00,02,a0,11,30,0f,06,09,2b,06,01,04,01,82,37,04,0c,03,02,\
00,02,a0,21,30,1f,06,09,2b,06,01,04,01,82,37,04,01,30,12,01,01,ff,01,01,00,\
01,01,00,01,01,00,01,01,00,01,01,00,a0,17,30,15,06,09,2b,06,01,04,01,82,37,\
04,02,30,08,01,01,00,01,01,ff,30,00,a0,1a,30,18,06,09,2b,06,01,04,01,82,37,\
04,03,30,0b,01,01,00,01,01,00,02,01,00,14,00,30,22,06,0a,2b,06,01,04,01,82,\
37,0f,03,03,30,14,06,09,2b,06,01,04,01,82,37,0f,01,31,07,30,05,03,01,00,30,\
00
I did 2 exports one with all the permissions (i.e. "Access to All files",
"Access to all Network Addresses") enabled, the other with all of them disabled.
By importing the files into the registry I enabled and then disabled all the java permissions.
Regarding the 'Use Java 2 version for <applet>' checkbox.... If UNCHECKED the mvm will be launched
for the following html code:
<APPLET code="Applet-name.class"  width=500 height=500>
     <param name="param1" value="value1"/>
</APPLET>For:
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" WIDTH = 695 HEIGHT = 525
               codebase="http://java.sun.com/products/plugin/1.3/jinstall-13-win32.cab#Version=1,3,0,0">
     <PARAM NAME = "CODE" VALUE = "SimpleApplet">
     <PARAM NAME="type" VALUE="application/x-java-applet;version=1.3">
     <PARAM NAME="scriptable" VALUE="false">
     <param name="param1" value="value-for-param1"/>
</OBJECT>the jvm 1.3 will be called to execute the applet code. If your browser doesn't behave this
way your registry settings may be messed up.
Let me know if this solves your problem
Regards
BG