Re: [gentoo-user] ebuild help: java main class?

[Grant <emailgrant@gmail.com>]

>> >> I'm trying to fix up the JAlbum ebuild:
>> >>
>> >> http://bugs.gentoo.org/show_bug.cgi?id=128356
>> >>
>> >> and get it to use java-pkg-2.  Here's what I have so far:
>> >>
>> >> inherit java-pkg-2 eutils
>> >>
>> >> S="${WORKDIR}/Jalbum"
>> >> DESCRIPTION="Web photo album generator"
>> >> HOMEPAGE="http://jalbum.net/"
>> >> SRC_URI="http://jalbum.net/download/Jalbum${PV}.zip"
>> >>
>> >> LICENSE="as-is"
>> >> SLOT="0"
>> >> KEYWORDS="x86"
>> >> IUSE=""
>> >>
>> >> DEPEND=">=virtual/jre-1.5"
>> >> RDEPEND="${DEPEND}"
>> >>
>> >> src_install() {
>> >>     java-pkg_dojar JAlbum.jar
>> >>     java-pkg_dolauncher jalbum \
>> >>         --jar JAlbum.jar \
>> >>         --java_args -Xmx400M
>> >>
>> >>     local dest=/usr/lib/${PN}
>> >>     dodir ${dest}
>> >>     cp -R ${S}/* ${D}/${dest} || die "Install failed"
>> >>
>> >>     doicon ${FILESDIR}/Jalbum-icon.png
>> >>     make_desktop_entry ${PN}
>> >> }
>> >>
>> >> It executes just fine, but I get:
>> >>
>> >> $ jalbum
>> >> Error: se.datadosen.jalbum.JAlbum
>> >> java.lang.ClassNotFoundException: se.datadosen.jalbum.JAlbum
>> >>       at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
>> >>       at java.security.AccessController.doPrivileged(Native Method)
>> >>       at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>> >>       at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>> >>       at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
>> >>       at se.datadosen.jalbum.Main.main(Main.java:23)
>> >>
>> >> I was told I need to define the main class with --main.  Does anyone
>> >> know how to determine what the main class should be?
>> >
>> > What's the line normally used to launch the app at runtime? That,
>> > together with CLASSPATH will tell you what class should be executed as
>> > main()
>>
>> There is a file called startjalbum.sh which is supposed to be used to
>> start the program.  It contains:
>>
>> #!/bin/sh
>> java -Xmx400M -jar JAlbum.jar
>>
>> Does that tell you anything?
>
> Yes, it does. There's a file called JAlbum.jar which contains the app, and
> it's location is visible to the script. There's no path so I'm assuming the
> file is in the current directory.
>
> A .jar is just a special kind of zip file (much like OOo files are). What's
> inside it?

# unzip JAlbum.jar
Archive:  JAlbum.jar
   creating: META-INF/
  inflating: META-INF/MANIFEST.MF
   creating: se/
   creating: se/datadosen/
   creating: se/datadosen/jalbum/
  inflating: se/datadosen/jalbum/AlbumBeanEvent.class
  inflating: se/datadosen/jalbum/AlbumBeanListener.class
  inflating: se/datadosen/jalbum/AlbumEngine.class
  inflating: se/datadosen/jalbum/Main$1.class
  inflating: se/datadosen/jalbum/Main.class
  inflating: se/datadosen/jalbum/MiniConfig.class
  inflating: se/datadosen/jalbum/OperationAbortedException.class
   creating: se/datadosen/tags/
  inflating: se/datadosen/tags/ElementException.class

> p.s. I don't know how familiar you are with Java's start-up process and how it
> finds things and how you specify things to find. It's somewhat unusual and
> many traps exist for the unwary :-)

I'm completely clueless with java.  Thanks a lot for your help thus far.

- Grant