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[java] Help with jar files [Solved]

Started by caseyd Jun 12, 2006 at 11:57 PM 3 replies 1.6k views

Original Post

Jun 12, 2006 at 11:57 PM

Hi, I just made an applet based Asteroids clone, and I am trying to create a jar file. Whenever I click on the jar file (in windows) it gives me a fatal exception occured. I am using this line to create my jar file: jar cvfm Asteroids.jar manifest.txt asteroids/*.class where asteroids is my package, and the directory that contains all the classes. My main class is called Asteroids.class. In the manifest file I have: Main-Class: asteroids.Asteroids including the new line at the end. I'm using eclipse as my ide and the applet runs fine within that. When I try and run the applet within Firefox, the status bar at the bottom says "Loading java applet failed". Checking the java console, I see this:


load: class Asteroids.class not found.
java.lang.ClassNotFoundException: Asteroids.class
	at sun.applet.AppletClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.applet.AppletClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.applet.AppletClassLoader.loadCode(Unknown Source)
	at sun.applet.AppletPanel.createApplet(Unknown Source)
	at sun.plugin.AppletViewer.createApplet(Unknown Source)
	at sun.applet.AppletPanel.runLoader(Unknown Source)
	at sun.applet.AppletPanel.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: C:\Projects\java\Asteroids\Asteroids\class.class (The system cannot find the file specified)
	at java.io.FileInputStream.open(Native Method)
	at java.io.FileInputStream.<init>(Unknown Source)
	at java.io.FileInputStream.<init>(Unknown Source)
	at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
	at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
	at sun.applet.AppletClassLoader.getBytes(Unknown Source)
	at sun.applet.AppletClassLoader.access$100(Unknown Source)
	at sun.applet.AppletClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	... 10 more

In my html file I have this


<html>
<head><title></title></head>

<body>
	<applet code="Asteroids.class" archive="Asteroids.jar" width="640" height="480"></applet>
</body>
</html>

I've looked around at Sun's website and tried a few different things, but I can't seem to get this to load correctly. I'm sure it's something little I'm forgetting but I'm kind of tired.. All help is greatly appreciated. Thanks [Edited by - caseyd on June 13, 2006 10:04:10 AM]

paulecoyote

138

paulecoyote

Jun 13, 2006 at 2:33 AM

The explorer thing is likely a program you've installed registered to say it can handle .jar files as archives (which is all they really are, .zip files with a different extension) - but it cannot.

As far as the class not found thing, it's because you've not told it in the command line or the jar's menifest which class contains the main() and where.

That's kind of Java 101 stuff, any good Java book should be able to point you in the right direction.

I mean look at the error:
C:\Projects\java\Asteroids\Asteroids\class.class

I'm guessing you don't have a class called class?

Perhaps this link might help:
http://java.sun.com/developer/codesamples/compression.html

caseyd

Author

caseyd

Jun 13, 2006 at 8:09 AM

Thanks for your response. I did indicate in my manifest file the name of the main class. Asteroids.class. This is also an applet so there is no "main". As I also said in the post, I tried following the examples from Sun's website and a book. I have a feeling that there is something causing a conflict here, that I can't figure out.

CaptainJester

101

CaptainJester

Jun 13, 2006 at 8:59 AM

You need to put the full package path to your class:

<html><head><title></title></head><body>	<applet code="Asteroids.Asteroids.class" archive="Asteroids.jar" width="640" height="480"></applet></body></html>

ps. As a convention, Java packages should not contain captial letters. If you use this convention, it will be easier for someone to help you.

caseyd

Author

caseyd

Jun 13, 2006 at 9:57 AM

Thanks CaptainJester. That fixed the problem loading the applet in the web browser, but I still can't run the jar file from explorer. As paulecoyote said, it's probably not being loaded right by the program. But, that's not as important to me. I'll have to mess around with it later.

Oh, wait a minute...You can't run applets that way. They have to be run using appletviewer.exe.

Again, thanks to the both of you.

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