[gentoo-java] Re: [mvn-intg] maven-from-source : An issue when invoking mvn

[Jörg Schaible]

Hi Kasun,

Kasun Gajasinghe wrote:

> Hi,
> After bumping more than 50 ebuilds, we were finally able to bump maven
> package itself. But there's few issues to get over with.
>
> Following error occurs when mvn-2.2 is invoked. As you probably
> already know, maven uses classworlds-1.1 for class loading. Further,
> upstream uses uberjar, which packages all the dependencies together.
> We have circumvented the need for having an uberjar by creating
> symlinks of needed jars under the directory /usr/share/maven-2.2/lib/.
>
> As I see, it fails before getting in to maven through classworlds.
> Unfortunately, I haven't have much experience with of classworlds
> behaves. Does anyone of you have any idea to get rid of this error?
> This _may_ not be an issue of maven having an incorrect classpath.
>
>  If this is through, we'll be much closer to getting maven from source
>  working.
>
> $ mvn-2.2 -X
> + Error stacktraces are turned on.
> Apache Maven 2.2.1 (r1135082; 2011-06-26 09:41:29+0530)
> Java version: 1.6.0_25
> Java home: /opt/sun-jdk-1.6.0.25/jre
> Default locale: en_US, platform encoding: ANSI_X3.4-1968
> OS name: "linux" version: "2.6.36-gentoo-r8" arch: "i386" Family: "unix"
> org.codehaus.classworlds.NoSuchRealmException: plexus.core
> at org.codehaus.classworlds.ClassWorld.getRealm(ClassWorld.java:128)
> at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:434)
> at org.codehaus.classworlds.Launcher.main(Launcher.java:375)


Did you try this without symlinks, just for test?


> Maven is called via classworlds with the command:
> "${JAVACMD}" \
> $MAVEN_OPTS \
> -classpath $(java-config -p classworlds-1.1) \
> -Dclassworlds.conf=/usr/share/maven-2/maven_home/bin/m2.conf \  #the m2.
> -Dmaven.home=/usr/share/maven-2.2 \
> -Dmaven.repo.remote=${HOME}/.m2/repository \
> -Dmaven.repo.local=${HOME}/.m2/repository  \
> ${CLASSWORLDS_LAUNCHER} \
> ${@}
>
> (The full script:
> http://overlays.gentoo.org/proj/java/browser/gsoc-maven-overlay/dev-
java/maven/files/2.2.1/bin/mvn)

Explain __MAVENHOME__ and __MAVEN_SHARE__.

I am also wondering about:

> -Dmaven.repo.remote=${HOME}/.m2/repository \
> -Dmaven.repo.local=${HOME}/.m2/repository  \

Note, that the format of the meta data in a remote and a local repo 
*differs*. AFAICS you cannot have both at the same location. Why not have 
one single system-wide remote repo, that is "stuffed" with the Gentoo-
installed libraries only? Simply add that to 
/usr/share/maven-2.2/conf/settings.xml in an always active profile named 
e.g. "gentoo-system".

>
> And, m2.conf file looks like this:
> =======
> main is org.apache.maven.cli.compat.CompatibleMain from plexus.core
>
> set maven.home default ${user.home}/m2
>
> [plexus.core]
> load ${maven.home}/lib/*.jar
> ========
>
> Let me know if any more information is needed

Maybe it's simply stupid?

$ file /usr/share/maven-bin-2.2/bin/m2.conf 
/usr/share/maven-bin-2.2/bin/m2.conf: ASCII text, with CRLF line terminators

- Jörg