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Java Forum / First Aid / March 2004Switching Between SUN and Microsoft JVM Programmatically
I've been given an interesting challenge by the IT department. They have software that uses the SUN JVM in IE on WinXP and won't work on the MS one and also vice versa. They've supplied me with the steps to change this in the "Sun Java Plug-in" Control Panel item and I found the steps to do it in "Internet Options" on the web. But they want it so it can be done programatically - one click off the desktop I guess. Do any of the gurus on here have an opinion as to how this might be done, whether it is undesirable for any reason and any other thoughts on the matter? I thought perhaps the only option was to change a registry setting using the Win32 API or something (can you tell I know very little about this?!) but then looking at the control panel item it looks too Java-y to be a Win32 thing so perhaps there is some way to change it from inside a java program (not an applet, obviously, but a full blown Java prog). Any ideas? Thanks, Tom > I've been given an interesting challenge by the IT department. > [quoted text clipped - 7 lines] > done, whether it is undesirable for any reason and any other thoughts on > the matter? Well I don't know exactly where the information is stored but I would have thought a simple .reg file should solve it (maybe change the PATH too). Alun Harford >>They have software that uses the SUN JVM in IE on WinXP and won't work >>on the MS one and also vice versa. They've supplied me with the steps [quoted text clipped - 4 lines] > Well I don't know exactly where the information is stored but I would have > thought a simple .reg file should solve it (maybe change the PATH too). Yeah, there is in fact a registry key that does the switch -- [HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Plug-in\1.4.2_01] "UseJava2IExplorer"=dword:00000001 -- but the more I think about this the more I think the IT dept. has asked for something silly. I mean, I make an app that says, "You have SUN Java 1.4.2 and MS Java 1.2 which do you want to use?" and the poor user has to work out what that means and choose one OR they use the Sun Control Panel extension which has been extensively tested and works just fine to do exactly the same thing. Basically both ways the users get confronted with techie nonsense that they have to do to make the apps work so why not confront them with the techie nonsense that is much less likely to be buggy and corrupt their registry?! Now if I could get the VM to change based on page visited in the browser or something like that then maybe but I don't think so somehow ... > Now if I could get the VM to change based on page visited in the browser > or something like that then maybe but I don't think so somehow ... Hmm... How do you fancy coding a complete browser :-) > -- but the more I think about this the more I think the IT dept. has > asked for something silly. I mean, I make an app that says, "You have > SUN Java 1.4.2 and MS Java 1.2 which do you want to use?" But... There is no MS Java 1.2 There's only 1.1.4, which missed the whole slew of bugfixes in 1.1.5 (not to mention anything else in 1.1.6, 1.1.7 and 1.1.8). >> -- but the more I think about this the more I think the IT dept. has >> asked for something silly. I mean, I make an app that says, "You have [quoted text clipped - 6 lines] > There's only 1.1.4, which missed the whole slew of bugfixes in 1.1.5 > (not to mention anything else in 1.1.6, 1.1.7 and 1.1.8). But _they_ in turn missed the slew of bugs and security holes introduced in the 3Meg of MS specific classes in the 1.1.4 MS VM. (sighs) In every gain, there is a loss. ;-)  SignatureAndrew Thompson * http://www.PhySci.org/ Open-source software suite * http://www.PhySci.org/codes/ Web & IT Help * http://www.1point1C.org/ Science & Technology >> I've been given an interesting challenge by the IT department. >> [quoted text clipped - 3 lines] >> the steps to do it in "Internet Options" on the web. But they want it >> so it can be done programatically - one click off the desktop I guess. Are these applets? applications in jar files? applications launched off desk-top? As someone else mentioned, you should be able to use a launcher file to set the runtime version for you applications. Applets can use HTML converter (better suited to a precisely controlled environment like intranet) to specify a particular Java VM. The JavaVersionApplet can ensure a JVM minimum version in a %100 Java solution. >> Do any of the gurus on here have an opinion as to how this might be >> done, whether it is undesirable for any reason and any other thoughts on >> the matter? It is more desirable to update the jar so that they will _all_ run on the latest VM. SignatureAndrew Thompson * http://www.PhySci.org/ Open-source software suite * http://www.PhySci.org/codes/ Web & IT Help * http://www.1point1C.org/ Science & Technology > They have software that uses the SUN JVM in IE on WinXP and won't work > on the MS one and also vice versa. Java code not running on the MS JVM I can understand, but java code not running on the Sun JVM I would have thought strange. Who developed it? Is this a common problem, anyone? (that is java not running on the Sun JVM) As a solution, how about trying the IBM JVM ... maybe both will run on that. Shane Free MagazinesGet these publications absolutely FREE for up to 12 months. 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