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Message-ID: <541f12ca0610021223p7e928841u4cc7d4917fb439b2@mail.gmail.com>
Date: Mon, 2 Oct 2006 21:23:21 +0200
From: "Stephane Nicoll" <stephane.nicoll@gmail.com>
To: "Maven Developers List" <dev@maven.apache.org>
Subject: Re: MNG-2571 - weird exception using the embedder
In-Reply-To: <4520FEE5.8090305@apache.org>
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Kenney and all,

On 10/2/06, Kenney Westerhof <kenney@apache.org> wrote:
> Hi, Stephane,
>
> I'm trying to reproduce this but I'm having trouble. First, the
> dependency on maven-plugin-testing-harness is missing. Secondly,
> even though the localRepoDir is correct, the ejb-sample-one and -two
> can't be found.

Wouh, I rever the maven-* dependency from 2.0.4 to 2.0.1 and it
worked. So either we introduced a regression in 2.0.1+ or I am missing
a mandatory dependency.

The SVN head of the ear plugin now builds successfully, commenting out
the testProject02 method allows to reproduce the classloader issue.

Thanks,
St=E9phane


>
> Anyway, the problem is with the setClassLoader(). That one already contai=
ns
> the EjbModule (and EarMojo) classes since they're in src/main/java. So th=
ey're also available
> to plexus.
>
> The embedder tries to configure another EarMojo in a new plugin classload=
er, and
> instantiates the EjbModule from the embedder classloader, not from the pl=
ugin classloader.
> That's because the plugin classloader delegates to the parent (the embedd=
er classloader),
> and finds an instance of the field class there.
>
> Solution: use an isolated classloader where the mojo code itself is NOT p=
art of the embedder.
> For instance, by using the maven-it-plugin, (or maven-invoker?) or by con=
structing a new classloader with the
> embedder archive and it's dependencies manually.
>
> -- Kenney
>
> Stephane Nicoll wrote:
> > On 10/1/06, Stephane Nicoll <stephane.nicoll@gmail.com> wrote:
> >> On 10/1/06, David Jencks <david_jencks@yahoo.com> wrote:
> >> >
> >> >
> >> > The classes are in different classloaders.  Hopefully the
> >> > classloaders' toString() will give you enough info about which ones
> >> > they are if you add that to the debugging.
> >>
> >> You're right. The interface and the actual implementation are in
> >> different classloaders.
> >
> > More specifically:
> >
> > Classloader...
> > Current thread
> > classloader[org.codehaus.classworlds.RealmClassLoader@b60b93]
> > type.getComponentType classloader[sun.misc.Launcher$AppClassLoader@e80a=
59]
> > values(0). classloader[org.codehaus.classworlds.RealmClassLoader@5e13ad=
]
> > The component Type is[ interface org.apache.maven.plugin.ear.EarModule]
> > The values elements are the following
> > Object class[org.apache.maven.plugin.ear.EjbModule] - is NOT
> > assignable to[interface org.apache.maven.plugin.ear.EarModule] !!!
> >
> > s/
> >
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--=20
Un chewing-gum? Non merci, jamais pour parler.

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