compiling java with gcc/gcj on knoppix 3.6

[oeri]

Hi, I'm trying to compile a simple helloworld on Knoppix 3.6. I get the following error when I run "gcc helloworld.java" or "gcc -x java helloworld.java"

Can't find default package 'java.lang' . Check the CLASSPATH environment variable and the access to the archives

Does anyone have any idea of what I should set the classpath to?

[nmrguy]

Never used knoppix, are you sure classpath is installed?

dpkg --list | grep classpath

[lakerdonald]

CLASSPATH isn't an something that can be installed. CLASSPATH is an environment variable, and you set it to a path (/some/directory/here). I'd assume that in this case, CLASSPATH would be the path to the directory where your compiler keeps all of the builtin classes, but don't quote me. Though I am certain you can't "install" it, cos its a variable, not an app
-lakerdonald

[nmrguy]

Sorry, let me clarify.

classpath is indeed a gnu version of java libraries which can be installed. And if one did, of course all variables would be set properly.

apt-cache show classpath

Package: classpath
Priority: optional
Section: libs
Installed-Size: 684
Maintainer: John Leuner <jewel@debian.org>
Architecture: i386
Version: 2:0.10.1-2
Depends: libgcj-common, libgtk2.0-0, libart-2.0-2, classpath-common (>= 2:0.10-1)
Conflicts: libgcj3 (<= 1:3.2-0pre1)
Filename: pool/main/c/classpath/classpath_0.10.1-2_i386.deb
Size: 418538
MD5sum: c8649a6f93956e160f17ee72de713ec5
Description: GNU Classpath - clean room standard Java libraries
Our goal is to provide a free replacement for Sun's proprietary class
libraries so that the GNU system can run programs written in the Java
language.
.
GNU Classpath makes it possible to compile DFSG-free programs written
in the Java language without depending on proprietrary class libraries.
.
GNU Classpath can be used to run Java applications without depending on
proprietary software.


I just assumed he wasn't talking about sun's java b/c it is not installed in Knoppix, although didn't consider he may have installed it directly from sun and would have to set the variable himself.

If that's the case, it is wherever the sun java package was installed (likely candidates being /opt/javaversion or /usr/javaversion of course)