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Java Forum / First Aid / December 2004java -jar HelloWorldApp.jar errors
error: C:\java>java -jar HelloWorldApp.jar Failed to load Main-Class manifest attribute from HelloWorldApp.jar contents: C:\java>jar -tf HelloWorldApp.jar META-INF/ META-INF/MANIFEST.MF HelloWorldApp.class creation: C:\java>jar -cvf HelloWorldApp.jar HelloWorldApp.class so..what's the error, pls? thanks, Thufir > error: > C:\java>java -jar HelloWorldApp.jar [quoted text clipped - 9 lines] > C:\java>jar -cvf HelloWorldApp.jar HelloWorldApp.class > so..what's the error, pls? You forgot: Main-Class: <class-name> in the manifest file.  Signature------------- - ByteCoder - ...I see stupid people ------------- Curiosity *Skilled* the cat thanks :) I'll be looking on the web, but if i may: where do I get the manifest? how do I edit it? where in the manifest to I add that line? thanks again, Thufir > thanks :) > [quoted text clipped - 6 lines] > > Thufir You can open/edit the jar file with any zip/archive program. In the JAR file there should be a directory called /META-INF. The manifest file itself is called manifest.mf Just add a line "Main-Class: <name of class>". The name of the class is relative to the root of the manifest file, so if the Main-Class HelloWorld is in the package helloWorld the Main-Class would be helloWorld.HelloWorld. Signature------------- - ByteCoder - ...I see stupid people ------------- Curiosity *Skilled* the cat from <http://java.sun.com/docs/books/tutorial/jar/basics/update.html> jar -umf manifest.mf mainClass.txt ?? or jar -umf mainClass.txt HelloWorldApp.jar I'm not sure about this. presumabely I need to specify mainClass.txt (since it has the updated info) and mainifest.mf (since that's the file to be updated) and the HelloWorldApp.jar (specifies which manifest.mf). thinking outloud here... > from <http://java.sun.com/docs/books/tutorial/jar/basics/update.html> > [quoted text clipped - 8 lines] > to be updated) and the HelloWorldApp.jar (specifies which manifest.mf). > thinking outloud here... Ok... you create a jar file. Please read the examples the jar file gives you when you execute it without arguments, it can explain it better than I can. Just don't forget to include you class files, which you don't do in the above example. Signature------------- - ByteCoder - ...I see stupid people ------------- Curiosity *Skilled* the cat from winzip it shows two files: HelloWorldApp.class Manifest.mf Manifest.mf has the path "meta-inf\" I've tried several different ways of editing the manifest, but can't get it. all I manage to create is a second Manifest.mf without the path... from winzip, how do I edit this file, pls? thanks, Thufir > from winzip it shows two files: > [quoted text clipped - 8 lines] > > from winzip, how do I edit this file, pls? From winzip? No idea. I use winrar and it works just fine. You could extract the zip file, edit it and put it back together... Signature------------- - ByteCoder - ...I see stupid people ------------- Curiosity *Skilled* the cat 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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