[Dr Evil]

I am taking an introductory course in programming that is based on Java. Since the first few programs are small and are CLI only. The programs complie and run in Project Builder with no problem but when I try to launch them from the terminal with the command:
java -jar RainFall.jar

I get the following error:
Failed to load Main-Class manifest attribute from RainFall.jar

I am doing wrong? The project type I chose in Project Builder was Java Tool. The source code is here. Thanks.

Dr Evil

[AirSluf]

Ahh, the "Black Art" of the executable .jar. The .jar needs to be told which class holds the main() method. The Manifest holds this little bit of information and you can create it in TextEdit then graft it into the .jar afterwards.

1) You need an empty text file usually named manifest.tmp
2) the first lines of text should be:

"Main-Class: MyClassName.class <cr>
<cr>"

where you MUST have 2 carriage returns or it will not work.

3) Now graft the manifest in with a:

"jar cfm myJar.jar manifest.tmp"

4) you could then try to execute --or-- verify the manifest made it in with a
"jar tvf myJar.jar"
to list the .jar's contents

This whole process is a royal pain in the butt and rarely works the first time for me. I usually re-consult my notes, book and buddy in that order. Then swear profusely at the machine before realizing it has finally taken. The process is easier but flakier when you use an IDE to help with the .jar-ing process.

Good Luck!

[ 08-26-2001: Message edited by: AirSluf ]