.jar file suddenly not working

I have some minimal experience working with .jar files, but I am baffled here.
Recently, the jar file for one of my programs stopped working. I had just made a change to my main class, so i repackaged the jar. Now it says "Can't find main class" when I try to run it. It will only work if I add the line
Class-Path: . (there is a period there)
to my manifest.
This would be fine, but I want to use exe4j to make it into a Windows executable. exe4j must do something where it does not honor the mainifest settings, because the executable gives out a "can't find main class" error no matter what.
What has happened? It is only an issue with this program, i have repackaged several others to test, and they work without the "Class-Path" workaround. I'm pretty sure that it's not something in the nature of the program itself, because it worked eariler, and my only change was a small one (the text of a few JLabels).
I have made sure that my main class is in the root of my jar file, and I have the Main-Class attribute correctly set in my manifest. The program runs fine outside the jar, but displays this odd behavior only when "jarred".
Any help would be greatly appreciated.

also, it's only the one class that's affected.
I tried setting the Main-Class to other classes in the jar, and that worked fine. When I tried to make a workaround, making one of the other classes' main call the one I wanted, i got a "fatal exception" error. I'm pretty sure it still couldn't find the file.

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You need to first test an example that works like the one in the article.
There are plenty of other examples on the web - find one you like:
http://javapapers.com/core-java/os-processes-using-java-processbuilder/
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java version "1.7.0_07"
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at java.net.URLClassLoader.defineClass(Unknown Source)
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at java.net.URLClassLoader$1.run(Unknown Source)
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at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
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here is /SMS/SMS
unknown source ?

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hello
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DrClap wrote:
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Charles Deister
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Yes,
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It works!!
This is what I did:
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Anyway I figure I'd share. Thanks for the help too.
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Welcome to the Sun forums.
Subject: My Applet Jar file doesn't work !! .
1) Note that one '!' denotes exclamation, whereas 2 or more often denotes a dweeb.
2) Since you are on your first post, I will point out that applets are an advanced topic, and should not be attempted by newbies.
3) "doesn't work" is very vague. It is likely to produce a reply like "maybe the applet is lazy - try flogging it".
Amera wrote:
..I have written this java applet :When posting code, code snippets, HTML/XML or input/output, please use the code tags. The code tags help retain the formatting and indentation of the sample. To use the code tags, select the sample and click the CODE button.
Also note that the most preferred form of code is an SSCCE *(<- link).* In an SSCCE, your would remove all but one button (if the actionPerformed fails with 6 or 7 buttons, trim it down to fail with just one or two.
i made a jar file :So does the applet work before you make the Jar file? Your post so far suggests the Jar file is the problem.
i created a file and named it MANIFEST.MF .i wrote inside it :
Main-Class: test
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I entered the test.class path and then wrote this command :
jar cvfm myjar.jar MANIFEST.MF *.class
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it's executed but this function "public void actionPerformed(ActionEvent e) " won't wrok.
i keep pressing the buttons but nothing is happening !!So you get 'no output in the console & no effect in the applet'?
What is the URL where I can see your applet failing?
As an aside, since Sun does not guarantee that applet clients will act on the showDocument command, even if it does not work, it would not be a 'bug'.
Edited by: AndrewThompson64 on Dec 28, 2009 11:18 AM

JAR file: could not find the main class.

I have been working with Java satisfactorily for about two years.
Installed a bigger hard disk.
Installed Windows XP.
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Hello,
I too am trying to use Axis2 application in R12. But getting the following error:
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.jar file suddenly not working

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