Cant get JAR file to execute

Question

I'm developing an application in using JDK 1.2.1 and Borland/Inprise's JBuilder Professional version 3.0 (the OS is MS windows 98).
My program is an application , not an applet.
My program runs OK from the jbuilder development environment, but now I want it standalone , as a .JAR file. Using jbuilders deployment wizard, I've created a .JAR file for my program ("untitled2.jar).
It includes a manifest.
I set up a test subdirectory c:\test and copied all the files from c:\program files\javasoft\jre\1.2\bin (which includes java.exe and javaw.exe). I then copied untitled2.jar to c:\test
I've looked in books & searched on the web site and I've tried various permutations of the syntax. For example I tried :
java -jar -cp c:\test untitled2.jar
but get the error message:
"Failed to load Main-Class manifest attribute from untitled2.jar"
Have I just got the syntax wrong or am I missing something else?
Also do I understand right that JRE.EXE has been replaced with JAVA.EXE (and JREW.EXE with JAVAW.EXE) ?
thanks in advance for any help
Mike

Answer 1

Thanks for the replies. I tried what you said :
I've replaced "untitled2.jar" with "loofabtest.jar" (actual name of the program)
The program is 2 java source files (loofabtest.java and frame1.java) , the main file is contained in
public class loofabtest within in loofabtest.java. The JAR file created is called loofabtest.jar
As I said previously the program runs OK from within jbuilder. All files & class names are lower case.
I used winzip (version 7.0) to open loofabtest.jar.
When I open loofabtest.jar there is a file called Manifest.mf with a path:
meta-inf\
when I open that there is NO line
Main-Class: my.main or similar
So I edit the Manifest.mf file & added a line :
Main-Class: loofabtest
Query 1: is this syntax right or should the line read: Main-Class: loofabtest.class
after editing the file , when I save it I get an overwrite option , if I say no , I end up with 2 manifest files (which I think wont work) If I yes to overwrite , the file loses the
meta-inf\     
path (i.e. there is no path)
I tried editing the manifest in jbuilder , but with no luck (jbuilder autogenerates the manifest)
I also tried extracting all the files in the JAR , editing the manifest , then rearchiving them. I get the error message
java.io.IOException: invalid manifest format
at java.util.jar.Manifest.read(Compiled Code)
at java.util.jar.Manifest.<init>(Manifest.java:55)
at sun.tools.jar.Main.run(Main.java:87)
at sun.tools.jar.Main.main(Main.java:760)
Query 2 : Is there an easy way to edit the manifest file to add the line needed and keep the meta-inf\ path?