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Java Forum / General / March 2008launching jar files in windows
Hi I've created a java game that is wrapped in a jar file. Because it uses large images it needs to run with increased memory; but for distribution reasons I don't want to have to use a windows batch file to do this. Is there any free software available that I can distribute with my program, that will allow me to do this? I have thought about creating a simple program that can be run to write a batch file, but I'm still not sure if windows will still not figure out what is going on and block it; and anyway I would rather find a more elegant solution to the problem. Thank you for any advice. Michael travel2light wrote on 08.03.2008 14:59: > Hi > I've created a java game that is wrapped in a jar file. Because it [quoted text clipped - 6 lines] > out what is going on and block it; and anyway I would rather find a > more elegant solution to the problem. Thank you for any advice. Check out launch4j. It creates an exe wrapper for your jar file, and you can specify JVM parameters. You can even embed the jar file in the exe if you want to. The exe will still require a JRE to be installed! http://launch4j.sourceforge.net/ Thomas > travel2light wrote on 08.03.2008 14:59: > [quoted text clipped - 16 lines] > > Thomas It works great. Thank you! You can make a .jar file executable. Just set the Main-Class attribute in the manifest. After that, double-clicking the .jar should execute whatever class you specified there. > Hi > I've created a java game that is wrapped in a jar file. Because it [quoted text clipped - 8 lines] > > Michael > You can make a .jar file executable. Just set the Main-Class attribute > in the manifest. After that, double-clicking the .jar should execute > whatever class you specified there. Hi The Jar file is already exucutable, but I don't think it is possible to set the heap size in the manifest. I tried sending the game to a friend using a batch file (using parameters 'java -jar -mx256m mygame.jar' to run it, but windows was suspicious of it, and wouldn't unpack it from a zip file. Michael >> You can make a .jar file executable. Just set the Main-Class attribute >> in the manifest. After that, double-clicking the .jar should execute [quoted text clipped - 6 lines] > mygame.jar' to run it, but windows was suspicious of it, and wouldn't > unpack it from a zip file. Is Windows the master or the servant? Isn't there a way for your friend to overcome Windows's suspicion, and command its compliance with their will? Failing that, couldn't your friend simply enter the 'java' command on their own command console?  SignatureLew > >> You can make a .jar file executable. Just set the Main-Class attribute > >> in the manifest. After that, double-clicking the .jar should execute [quoted text clipped - 17 lines] > -- > Lew Yes indeed, they can do this. Or they can create their own batch file. But I am looking for ways to make my game more accessible than that. > The Jar file is already exucutable, but I don't think it is possible > to set the heap size in the manifest. I tried sending the game to a > friend using a batch file (using parameters 'java -jar -mx256m > mygame.jar' to run it, but windows was suspicious of it, and wouldn't > unpack it from a zip file. There are no real solution but some workarounds: 1) create a link to javaw -Xmx256m -jar mygame.jar to run your app 2) change the jar command associated with .jar to have -Xmx256m 3) rename the file to .bigjar and associate that file extension with a javaw command with -Xmx256m Arne > ...it needs to run with increased memory; Java Web Start can reserve extra memory for an app. -- Andrew T. PhySci.org > > ...it needs to run with increased memory; > [quoted text clipped - 3 lines] > Andrew T. > PhySci.org Can I run stand alone applications using Java Web start? I think I need to install my program on a web server to do this right? Please forgive my ignorance about the technical stuff. I'm a self- taught computer programmer + I do this for fun. Although I hope one day to make some cash doing this, I'm not holding my hopes too high! Michael > Can I run stand alone applications using Java Web start? I think I > need to install my program on a web server to do this right? I think so. JWS can do an install from a CDROM, or other media. Do a Google search for JWS CDROM, I think there's a fair amount of stuff out there. Here's one link I found: <http://java.sun.com/j2se/1.5.0/docs/guide/javaws/developersguide/cdinstall.03.06.html> > > Can I run stand alone applications using Java Web start? I think I > > need to install my program on a web server to do this right? > > I think so. ... Correct. I had been meaning to test offline install myself, but have not gotten around to it. -- Andrew T. PhySci.org On Sat, 8 Mar 2008 05:59:13 -0800 (PST), travel2light <everything2light@yahoo.co.uk> wrote, quoted or indirectly quoted someone who said : >I've created a java game that is wrapped in a jar file. Because it >uses large images it needs to run with increased memory; but for [quoted text clipped - 5 lines] >out what is going on and block it; and anyway I would rather find a >more elegant solution to the problem. Thank you for any advice. you could write a microscopic "kicker" program in C that execs Java.exe. see http://mindprod.com/project/kicker.html I know of no way to put command line arguments destined for java.exe inside the jar in the manifest. However, if you use JAWS, you can put them in the JNLP file which lives outside the jar. The reason for this is, by the time the java.exe JVM gets around to looking inside jars, it has already cast in stone everything it learned from the command line. -- Roedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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