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Date: Sat, 24 Oct 2009 21:35:48 -0700
Message-ID: <49bf44f10910242135g3318bbe5w1ef9fd2e010bbc95@mail.gmail.com>
Subject: Re: [gentoo-user] ebuild help: java main class?
From: Grant <emailgrant@gmail.com>
To: gentoo-user@lists.gentoo.org
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>> I'm trying to fix up the JAlbum ebuild:
>>
>> http://bugs.gentoo.org/show_bug.cgi?id=3D128356
>>
>> and get it to use java-pkg-2. =A0Here's what I have so far:
>>
>> inherit java-pkg-2 eutils
>>
>> S=3D"${WORKDIR}/Jalbum"
>> DESCRIPTION=3D"Web photo album generator"
>> HOMEPAGE=3D"http://jalbum.net/"
>> SRC_URI=3D"http://jalbum.net/download/Jalbum${PV}.zip"
>>
>> LICENSE=3D"as-is"
>> SLOT=3D"0"
>> KEYWORDS=3D"x86"
>> IUSE=3D""
>>
>> DEPEND=3D">=3Dvirtual/jre-1.5"
>> RDEPEND=3D"${DEPEND}"
>>
>> src_install() {
>> =A0 =A0java-pkg_dojar JAlbum.jar
>> =A0 =A0java-pkg_dolauncher jalbum \
>> =A0 =A0 =A0 =A0--jar JAlbum.jar \
>> =A0 =A0 =A0 =A0--java_args -Xmx400M
>>
>> =A0 =A0local dest=3D/usr/lib/${PN}
>> =A0 =A0dodir ${dest}
>> =A0 =A0cp -R ${S}/* ${D}/${dest} || die "Install failed"
>>
>> =A0 =A0doicon ${FILESDIR}/Jalbum-icon.png
>> =A0 =A0make_desktop_entry ${PN}
>> }
>>
>> It executes just fine, but I get:
>>
>> $ jalbum
>> Error: se.datadosen.jalbum.JAlbum
>> java.lang.ClassNotFoundException: se.datadosen.jalbum.JAlbum
>> =A0 =A0 =A0 =A0at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
>> =A0 =A0 =A0 =A0at java.security.AccessController.doPrivileged(Native Met=
hod)
>> =A0 =A0 =A0 =A0at java.net.URLClassLoader.findClass(URLClassLoader.java:=
188)
>> =A0 =A0 =A0 =A0at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>> =A0 =A0 =A0 =A0at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
>> =A0 =A0 =A0 =A0at se.datadosen.jalbum.Main.main(Main.java:23)
>>
>> I was told I need to define the main class with --main. =A0Does anyone
>> know how to determine what the main class should be?
>
>
> No, it has clearly already loaded at least one class (last line of that
> stack trace reveals this), and is looking for some others needed by that
> class -- but the classloader fails to find them. JAlbum probably also has=
a
> Main-Class header defined in the jar's manifest, so this is likely to be
> just another classpath-related issue.
>
> But the ebuild you're pushing ... I think it would need some serious work
> for the installation part. I think it installs files in all wrong places,
> and thus Gentoo's Generation 2 java system cannot automatically add them =
to
> classpath.
>
> There is some advice on the issue in section 3, the Filesystem layout ove=
r
> here:
>
> http://www.gentoo.org/proj/en/java/java-devel.xml
>
> After trudging through that you might understand why Gentoo Java team has
> constantly several dev positions advertised on "help wanted". Some of Jav=
a's
> ways don't mix that well with Gentoo's approaches, especially with compil=
ing
> and packaging (installations).
>
> If you are in a hurry of some sort, you might just try taking the jar,
> unpacking it into a subdir under your homedir, cd'ing in, and trying
> something like "CLASSPATH=3D.:${CLASSPATH} foo.sh". With a little luck it
> might work as such, without the pain of making a proper ebuild for it.
>
> --
> Arttu V.
So 'emerge JAlbum' isn't feasible?
- Grant