Working of jar files

Hello Guys,

I created a project using Log4j framework in Netbeans on Windows, build and executed it using the generated jar file like below:



The contains of Manifest file within the Log4jTesting.jar is




Then I moved Log4jTesting.jar to another drive without the dependent libraries and tried to execute it but got following exception



So I set the classpath manually to "D:\myPro\Log4jTesting\dist" like below and tried executing again but still got the same exception



Can someone please tell me what I am doing wrong here ?

Thanks.

The Class-Path manifest entry overrides the classpath environment variable

When you moved the jar file to E drive without the dependency, it looks in the manifest file "classpath" for the dependency. You can try

java -cp <classpath on D> -jar <filename>

EDIT: remove the manifest class path and use the -cp flag to run.

K. Tsang wrote:java -cp <classpath on D> -jar <filename>

That is not going to work; the "-cp" option will be ignored when you use the "-jar" option. You can try running it without "-jar", but you'll have to specify the main class name on the command line. Put the jar file for the application and all dependency jar files on the classpath:

java -cp log4j.jar;myprogram.jar com.mypackage.MyProgram

Khuzema Dharwala wrote:Then I moved Log4jTesting.jar to another drive without the dependent libraries

Why did you do that? Your program obviously needs those other jar files. The dependencies are not compiled into your jar - you don't only need them when you compile the program, but also when you run the program.