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Java Forum / General / August 2007How to run jar file using Runtime
Hi, Here is my problem. I can write: Runtime.getRuntime().exec("java -jar app.jar"); but suppose I have only Java Runtime Enviroment and app.jar. So i can't type java -jar app.jar because i don't have JDK I can't type Runtime.getRuntime().exec("app.jar"); either. But i can run app.jar in command line typing app.jar My question is: How to run app.jar from code without using JDK? Can Runtime be useful here? Thanx Why I can type "app.jar" in Windows command line but i cant put "Runtime.getRuntime().exec("app.jar");" in my java code? > Why I can type "app.jar" in Windows command line but i cant put > "Runtime.getRuntime().exec("app.jar");" > > in my java code? Why did you repeat your question? "app.jar" is not a command; that's why you couldn't execute it. When you think you execute it from the command line, the command processor is actually invoking the OS's "preferred app" association and invoking the "java" command. Runtime cannot do that because you didn't invoke the command processor with it, you tried to invoke the JAR. Without the command processor, there's nothing to invoke the OS's association for you. > Here is my problem. I can write: > [quoted text clipped - 6 lines] > > because i don't have JDK Sure you can. > I can't type > > Runtime.getRuntime().exec("app.jar"); > > either. Because app.jar is not an executable. > But i can run app.jar in command line typing > > app.jar Because the command processor knows how to use the OS's application associations. > My question is: How to run app.jar from code without using JDK? Can > Runtime be useful here? You don't need the JDK to run a JAR, just the JRE.  SignatureLew > > but suppose I have only Java Runtime Enviroment and app.jar. So i > > can't type [quoted text clipped - 5 lines] > Sure you can. > Lew Thanx Lew, that solves my problem i think :-) 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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