Landon, To do it in the batch file you would need to be able to do something like java --version and then extract the version string from it. Then do some parsing on the line that contains the version to convert it to a meaningful double so you could compare it. Now doing that in unix is "fairly" easy, on Windows not so easy.
Then you have to take into account different versions of java (e.g. Sun v.s. blackdown) may have slightly different formats for how the version is displayed. Paul Sunburned Surveyor wrote: > Maybe I misspoke. I was thinking we could do the check in the batch > file itself, and not in any of OpenJUMP's Java source code. > > Is that possible? > > Landon > > On 9/24/07, Paul Austin <[EMAIL PROTECTED]> wrote: > >> In the JUMP launcher we can look at the SystemProperty >> java.specification.version to make sure it is >= 1.5 if not we display a >> window that says you must have version 1.5 or greater and maybe provide >> a clickable link to the Java site. Unfortunately if we compile that >> class with 1.5 they won't even get that far. >> >> >> Paul >> >> >> Larry Becker wrote: >> >>> After looking over the literature, I don't see a cross-platform >>> solution that wouldn't add to the potential problem. I'm concerned >>> that it might incorrectly stop JUMP from running when it was actually >>> possible, due to variations in the platform and JVM. >>> >>> If it makes it as far as displaying the splash screen before lockup, >>> we could simply add the text "Java version 1.5 or higher required" to >>> the splash screen. That way when it locks up, at least the user is >>> looking at a possible solution. >>> >>> regards, >>> Larry >>> >>> On 9/24/07, *Sunburned Surveyor* <[EMAIL PROTECTED] >>> <mailto:[EMAIL PROTECTED]>> wrote: >>> >>> Jukka, >>> >>> I have no idea how we might handle the JRE version in the batch script >>> on Windows or Linux. Maybe Larry or Paul have suggestions? >>> >>> Maybe we need to add a switch statement to the batch script that uses >>> the "java -version" command and prints an error message if the >>> installed version isn't appropriate. >>> >>> If Larry and Paul can confirm I'll see if I can modify the launch >>> scripts to do this. >>> >>> The Sunburned Surveyor >>> >>> On 9/23/07, Rahkonen Jukka <[EMAIL PROTECTED] >>> <mailto:[EMAIL PROTECTED]>> wrote: >>> > Hi, >>> > >>> > Could it be possible/simple to add some kind of Java version >>> check during OpenJUMP startup? We have lots of Java Web Start >>> applications, an with them the minimum (or even strict) Java >>> version can be advertised in the .jnlp file. For the same reason >>> our users may need several Java JRE versions installed, and >>> sometimes it is hard to know which is the default one that is >>> started by openjump.bat file. Users would be better off if they'd >>> see message like "Java version 1.x or higher required" instead of >>> nothing at all, all perhaps something as informative as "Unable to >>> launch". >>> > >>> > -Jukka Rahkonen- >>> > >>> > >>> >>> ------------------------------------------------------------------------- >>> > This SF.net email is sponsored by: Microsoft >>> > Defy all challenges. Microsoft(R) Visual Studio 2005. >>> > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >>> > _______________________________________________ >>> > Jump-pilot-devel mailing list >>> > Jump-pilot-devel@lists.sourceforge.net >>> <mailto:Jump-pilot-devel@lists.sourceforge.net> >>> > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>> <https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel> >>> > >>> >>> >>> ------------------------------------------------------------------------- >>> This SF.net email is sponsored by: Microsoft >>> Defy all challenges. Microsoft(R) Visual Studio 2005. >>> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >>> _______________________________________________ >>> Jump-pilot-devel mailing list >>> Jump-pilot-devel@lists.sourceforge.net >>> <mailto:Jump-pilot-devel@lists.sourceforge.net> >>> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>> >>> >>> >>> >>> -- >>> http://amusingprogrammer.blogspot.com/ >>> ------------------------------------------------------------------------ >>> >>> ------------------------------------------------------------------------- >>> This SF.net email is sponsored by: Microsoft >>> Defy all challenges. Microsoft(R) Visual Studio 2005. >>> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >>> ------------------------------------------------------------------------ >>> >>> _______________________________________________ >>> Jump-pilot-devel mailing list >>> Jump-pilot-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>> >>> >> ------------------------------------------------------------------------- >> This SF.net email is sponsored by: Microsoft >> Defy all challenges. Microsoft(R) Visual Studio 2005. >> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >> _______________________________________________ >> Jump-pilot-devel mailing list >> Jump-pilot-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >> >> > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
