getting started with compiling java - please help

[Andreas Hetzmannseder <hetzmann@netway.at>]

Hi debian-users,

For the time being I would like to compile some kind of HelloWorld
application, be it with gcj, jikes or kjc. All of the three give me
error messages, and I have no idea how to fix them. Here they are:

with gcj:
    /usr/lib/crt1.o: In function `_start':
    /usr/lib/crt1.o(.text+0x18): undefined reference to `main'
    collect2: ld returned 1 exit status

with jikes:
    Found 2 system errors:

    *** Error: Could not find package named
        /usr/share/java/repository/java/util

    *** Error: Could not find package named
        /usr/share/java/repository/java/lang

with kaffe's kjc:
    java.lang.NoClassDefFoundError: at/dms/kjc/Main
        at java.lang.Throwable.<init>(Throwable.java:38)
        at java.lang.Error.<init>(Error.java:21)
        at java.lang.LinkageError.<init>(LinkageError.java:21)
        at java.lang.NoClassDefFoundError.<init>(NoClassDefFoundError.java:21)

My CLASSPATH would be /usr/share/kaffe

Any suggestion on what is wrong or missing will be highly appreciated.

Thank you,
Andreas.