Re: Question: How to create a manifest classpath

[Brent Hale]

We had to tackle the same thing and did the following:

   <!--==================================================================
       createClassPathManifest:
      
       This will create a target/conf/MANIFEST.MF file which contains
       the "Class-Path" property in it which contains the list of all
       jar files the project is dependent on.
       
==================================================================-->   
   <goal name="jbrew:createClassPathManifest">
       <!-- create target directory where new manifest will be created. -->
       <mkdir dir="${maven.build.dir}/conf"/>
      
       <!-- Get a variable with the classpath value -->
       <j:set var="depsClassPath" value=""/>
       <j:forEach var="dep" items="${pom.artifacts}">
           <j:set var="depsClassPath" value="${depsClassPath} 
${deploy.lib.dir}/${dep.name}"/>
       </j:forEach>
     
       <!-- create a dynamic manifest file for performing java -jar -->
       <manifest file="${maven.build.dir}/conf/MANIFEST.MF">
           <attribute name="Class-Path" value="${depsClassPath}"/>
       </manifest>
   </goal>

Then in your project.properties file you need to include this:

maven.jar.mainclass=com.evnt.eve.Eve      <!-- specific to your project -->
maven.jar.manifest=target/conf/manifest.mf   <!-- to use the above 
created manifest.  -->

Hope that helps,
Brent
Siegfried Göschl wrote:

Hi Michal,

I had a look at uberjar a few months ago but encountered performance 
problems due to the URLClassloader - it takes ages to pull in my JARs 
.... :-).

 

Orginale Mail Snippet >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
       

But it is too slow - my JAR is about 11.5 MByte and starting it 
takes now 150 seconds instead of 3 seconds. After loading all the 
classes there is still a performance degration of the factor 5 - my 
tests runs now in 19.5 sec instead of 3.8 seconds.
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

As a workaround I'm using the javaapp plugin hosted on http://maven-
plugins.sourceforge.net/ ... the most recent version for Maven B10 is 
actually found within the CVS since I had no time to upload a new 
release of it.

Cheers,

Siegfried Goeschl

On 31 Jul 2003 at 22:26, Michal Maczka wrote:

 

take a look what uberjar plugin does.

Michal

   

-----Original Message-----
From: Erik Husby [mailto:[EMAIL PROTECTED]
Sent: Thursday, July 31, 2003 10:21 PM
To: Maven Users List
Subject: Re: Question: How to create a manifest classpath
Quoting Siegfried Göschl <[EMAIL PROTECTED]>:

     

Hi Erik,

I'm not quite sure if I'm qualified to answer your question since
this is the first time that I heard of a manifest classpath ...
:-) ... but I asked Google.
And Google knows a few things about it - you might find the
relevant code it the maven.ejb-plugin ...
Hope this helps,

Siegfried Goeschl
       

That is exactly what I am looking for -- thanks.

FYI a manifest classpath allows one easily package an application so
that you can do the following:
     

cd somedirectory
java -jar application.jar
       

Assuming that the application jar and all its related jar files are
in the directory "somedirectory".
On Windows this means you can double click on a jar file to
launch the application.
--
Erik Husby
Team Lead for Software Quality Automation
Whitehead Institute/MIT Center for Genome Research
Rm 2192
320 Charles St
Cambridge, MA 02141-2023
mobile: 781.354.6669
office: 617.258.9227
[EMAIL PROTECTED]


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