jar problem

I am trying to create a jar. But when I try to run the jar command following errors occur:
Error: could not find libjava.so
Error: could not find Java 2 Runtime Environment.
I have read posts from people having same problem but couldnot solve the error.Please help.

Please supply more details, otherwise we can’t help.

What command are you using?

What are the contents of the .jar’s manifest file?

What happens when you execute java -version and javac -version from the command line?

Tell us the full error message, using copy-and-paste.

command : jar cf jar-file input-files
java -version: java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)
The error message I gave in my first post is the full error message

Shweta Grewal wrote:Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)

Is the machine you try a 64-bit?

It must be a 64 bit machine, otherwise he would never have installed a 64 bit JVM.

Please give the exact command you are using to create the .jar, not the generic one copied from the documentation page.

What operating system are you using? Is it a Unix-like operating system (a Linux distribution, or Mac OS X)?

About 64-bit: For your own Java software, it doesn't matter if the machine is 32-bit or 64-bit. You do not need to do anything special to make your Java program run on a 32-bit or 64-bit machine.

I am using Linux(Centos)

Campbell Ritchie wrote:It must be a 64 bit machine, otherwise he would never have installed a 64 bit JVM.

I wrongly thought running 64 bit JVM on a 32 bit might create issues.

I get same results when I execute :
jar
without anything

It sounds like Java is not properly installed on your machine; try to re-install it.

but commands like
javac work

It works.
I gave the full path of jar command instead of writing jar I write $JAVA_HOME/bin/jar
Thanks all for your help

If sorting out your PATH cured the problem, you should review your system PATH.