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From: markspace <-@.>
Newsgroups: comp.lang.java.programmer
Subject: Re: cannot create the runnable JAR file containing 3rd party JAR files
Date: Wed, 21 Dec 2011 14:23:48 -0800
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On 12/21/2011 12:03 PM, www wrote:

> I have had a really hard time to create a runnable JAR file using
> Ant(version 1.6.5). The JAR file, libs/installed/sample.jar, can be
> generated. However, when I run it, the classes inside a.jar or b.jar
> are not available and causes NullPointerException. When I un-tar
> sample.jar, everything is there. I think manifest classpath is causing
> the problem.
>


Could you show us the actual error message?  It would help.  Also when 
the error occurs, if there aren't too many lines in between the launch 
and the error message.

Also please show us the Java command line itself and the contents of the 
Jar and manifest file.

Like this:

Brenden@Kageyama ~/Dev/proj/hw/dist
$ java -jar hw.jar
Hello world!  <<-- you would have an error message here instead

Brenden@Kageyama ~/Dev/proj/hw/dist
$ jar -tf hw.jar
META-INF/
META-INF/MANIFEST.MF
hw/
hw/Hw.class

Brenden@Kageyama ~/Dev/proj/hw/dist
$ jar -xf hw.jar META-INF/MANIFEST.MF

Brenden@Kageyama ~/Dev/proj/hw/dist
$ ls
META-INF  README.TXT  hw.jar

Brenden@Kageyama ~/Dev/proj/hw/dist
$ cat META-INF/MANIFEST.MF
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.2
Created-By: 1.7.0-b147 (Oracle Corporation)
Class-Path:
X-COMMENT: Main-Class will be added automatically by build
Main-Class: hw.Hw


> 		<pathconvert property="manifest.classpath" pathsep=" ">
> 			<mapper>
> 				<chainedmapper>
> 					<!-- remove absolute path -->
> 					<flattenmapper />


Neat, I learned something new.