facing problem with jar

hi is there any one who can help me immediately?

I have developed an application previously, using jbuilder9 and jdk1.4. but now i am using jbuilder2006. and jdk1.5. after developing the application i have tried to build executable file and my executable file runs without any problem but the jar file didn't work. the system shows a message "Invalid or Corrupt jar file". I don't understand why the jar file is not working. I currently use jre1.5 but previously I used jre1.4.

plz help me.

[511 byte] By [rahed_bda] at [2007-10-2 21:49:15]
# 1
As per I knowAnd also confirm that the path and CLASSPATH variable set or not.After go in your source directory where all the class files located and use the following command on command prompt jar cf sample.jar *.classMessage was edited by: Dhaval
Dhavala at 2007-7-14 1:05:00 > top of Java-index,Core,Monitoring & Management...