Question

This issue is related to running a Java program (jar) dependent on thirdparty jar library even after setting classpath and trying so many other methods by reading articles in Internet.

I want to use a thirdparty Pack1.jar (it is not a part of jvm) as dependency of my programme.
I do not know where the Pack1.jar file could be in the deployment machine and I want the deployer to specify the path for the thirdparty libraries

I have tried the following alternatives in vain

1. Setting the java.class.path programatically

   String class_path = args[0];
   System.setProperty("java.class.path",class_path);
   

   Here I am assuming that deployer would supply the classpath as first argument while running the program

2. Setting the CLASSPATH env_var to locate the thirdparty directory

3. While running, using the classpath option

   java -classpath /path/to/Pack1.jar -jar Pack2.jar 
   

   I think this would not work because documentation says that classpath is ignored when program is run with “java -jar”

4. Setting the java.ext.dirs programatically.

5. Setting the java.library.path programatically.

I do not want to specify the Class-Path in manifest because that takes only relative path and I do not know where the thirdparty library would be kept in deployment machine

But I am unable to get the jar running.

How can I fix this problem any help please.

Answer 1

Go for option 3. Put both jars on the classpath like this:

java -classpath '/path/to/Pack1.jar:/path/to/Pack2.jar' com.packagename.yourclassname

Note, that this is for Linux. on Windows, you would separate classpath elements with semicolons:

java -classpath "/path/to/Pack1.jar;/path/to/Pack2.jar" com.packagename.yourclassname

http://en.wikipedia.org/wiki/Classpath_%28Java%29