asked on

how to set classpath jar file while jar in jar file?

for example i have files:

----------------------
mianclass.txt
a.jar
myclass.class
----------------------

mianclass.txt contain:
--------------------------
Main-Class: myclass
-------------------------

and i make a jar file again
---------------------------------------------------------
jar cmf mainclass.txt run.jar myclass.class a.jar
---------------------------------------------------------

so i got file run.jar,and i run the file
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java -jar run.jar
--------------------

when i run the file it got error like this "Exception in thread "main" java.lang.NoClassDefFoundError".
How to set classpath a.jar? it set in mainclass.txt or where?

Mick Barry

instead of including a.jar, extract it and include its contents

Mick Barry

alternatively don't include a.jar at all and distribute it along with run.jar and specify it using the class-path attibute in your manifest

http://java.sun.com/docs/books/tutorial/deployment/jar/downman.html

Yozj

1. mainclass.txt must contain:
--------------------------
Main-Class: myclass

-------------------------
Last blank string is necessary. Make sure that your file named "mainclass.txt", not "mianclass.txt".

2. Use this command for generate JAR file:
jar cfm run.jar mainclass.txt myclass.class a.jar

3. About classpath:
--------------------------
Main-Class: myclass
Class-Path: yourpackage/a.jar

-------------------------

iphone

ASKER

Yozj what you mean

-------------------------------------
Class-Path: yourpackage/a.jar
--------------------------------------
"yourpackage" ??

a.jar is in run.jar right, and a.jar and myclass.class at the same lavel.
So what is "yourpackage" mean?

iphone

ASKER

objects i dun't want extract a.jar file, because a jar file is jpedal.jar (other library )

Yozj

If the same level then "Class-Path: a.jar"

iphone

ASKER

if i set Class-Path: a.jar, it get a.jar from outside run.jar.
not get a.jar in run.jar.

ASKER CERTIFIED SOLUTION