JAR using another JAR

Question

Hi,
I have created in Eclipse simple class Blah.class:
public class Blah {
     public Blah() {
          System.out.println("Inside blah");
Then I made a JAR file: C:\Blah.jar
Then I made in Eclipse another project with a simple class BlahBlah.class and linked Blah.jar file in this project:
public class BlahBlah {
     public BlahBlah() {
          System.out.println("Inside BlahBlah");
          Blah b = new Blah();
     public static void main(String arg[]) {
          BlahBlah bl = new BlahBlah();
Then I made another JAR file C:\MyJar\BlahBlah.jar from this project as an executable JAR.
But when I tried to run the second JAR from command line bad things happened. This is the output:
C:\MyJar>java -jar BlahBlah.jar
Inside BlahBlah
Exception in thread "main" java.lang.NoClassDefFoundError: Blah
at BlahBlah.<init>(BlahBlah.java:5)
at BlahBlah.main(BlahBlah.java:8)
Java execution started, but first JAR (C:\Blah.jar) was not found. In CLASSPATH variable I have following value: C:\Blah.jar
So, what am I doing wrong?
Thanks in advance. Lokutus.

Answer 1

When executing a jar, that jar has a personal classpath if I'm not mistaken, the CLASSPATH variable is ignored (which is logical, because only your system has that classpath. When executing the jar on another system you want the jar to execute without any environment variables being needed).
I know that in the META-INF/MANIFEST.MF file inside the executable jar you can list jar files that the executable jar depends on. The line would look like:
Class-Path: jar1.jar jar2.jar
and so forth (seperate by a space). What I don't know is how to make the mkjar tool create this line... google is probably your best friend.