The URL which describes the the supported writing systems refers
to Red Hat 8.0 or Red Hat 7.3.

See:

http://java.sun.com/j2se/1.4.2/docs/guide/intl/locale.doc.html#eucJP
...
(3) on Turbolinux 7 Workstation.
(4) on Red Hat 8.0.
(5) on RedHat 7.3, SuSE 8.0, Turbolinux 7 Workstation.
...

The general page which details the general Linux distributions doesn't support
these configurations see below

http://java.sun.com/j2se/1.4.2/system-configurations.html

supported system configuration
IA32 Linux
Red Hat Enterprise Linux WS 2.1 Gnome-sawfish 1.0
Red Hat Enterprise Linux ES 2.1 Gnome-sawfish 1.0
Red Hat Enterprise Linux AS 2.1 Gnome-sawfish 1.0
SUSE 8.0 Gnome-sawfish 2.0
TurboLinux 7.0 Gnome-sawfish 1.0
SUSE Linux Desktop (SLD) 8 Gnome2-metacity 2.4.34
SUSE 8.2 personal
Gnome2.2-Metacity 2.4
Red Hat Enterprise Linux 3.0 WS
Gnome2.2-Metacity 2.4
Red Hat Enterprise Linux 3.0 ES
Gnome2.2-Metacity 2.4
Red Hat Enterprise Linux 3.0 AS
Gnome2.2-Metacity 2.4
Sun Java Desktop System 2003
Gnome2-metacity 2.4
SUSE Linux Enterprise Server (SLES) 8
Gnome2-metacity 2.4
SUSE Linux Enterprise Server (SLES) 9
Gnome2-metacity 2.4
SUSE 9.0 professional
Gnome2.2-Metacity 2.4

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